feat: Add support for multi-partition parquet:kv tables

[georgecwan]

Added feature to IrisGridPartitionSelector to display additional partition selector dropdowns when more than one partition column is present. The values displayed in the dropdown depend on the selected partitions of columns to the left of it.

The "Append Command" button and associated functions are removed in preparation for #1143.

Closes #1438

Testing instructions:

1. Create and open a multi-partition table:

from deephaven import empty_table

part = empty_table(4).update("II=ii")

from deephaven.parquet import write, read

write(part, "/tmp/pt-1438/x=0/y=0/part.parquet")
write(part, "/tmp/pt-1438/x=0/y=1/part.parquet")
write(part, "/tmp/pt-1438/x=1/y=0/part.parquet")
write(part, "/tmp/pt-1438/x=1/y=1/part.parquet")

partition_table = read("/tmp/pt-1438")

2. Use the dropdown to select any combination of partitions and check that it updates the table correctly.
   • The dropdown should only display values that are available after filtering for all the partitions left of it. (E.g. A state/province dropdown should only contain the states/provinces corresponding to the selected country.)
3. Test filtering by typing directly in the dropdown and searching by using the search bar above the list of available partitions.
4. Retest using other data types for partition columns (dates, strings, chars, doubles). E.g:

from deephaven.parquet import write, read

write(part, "/tmp/pt2-1438/date_partition=2023-08-01/id_partition=id-001/decimal=0.1/part.parquet")
write(part, "/tmp/pt2-1438/date_partition=2023-08-01/id_partition=id-002/decimal=0.15/part.parquet")
write(part, "/tmp/pt2-1438/date_partition=2023-08-02/id_partition=id-001/decimal=0.08/part.parquet")
write(part, "/tmp/pt2-1438/date_partition=2023-08-02/id_partition=id-002/decimal=0.08/part.parquet")
write(part, "/tmp/pt2-1438/date_partition=2023-08-02/id_partition=id-003/decimal=0.1/part.parquet")

partition_table = read("/tmp/pt2-1438")

[codecov]

Codecov Report

Attention: 103 lines in your changes are missing coverage. Please review.

Comparison is base (f440a38) 46.65% compared to head (c80cd42) 46.73%.
Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1580      +/-   ##
==========================================
+ Coverage   46.65%   46.73%   +0.08%     
==========================================
  Files         575      583       +8     
  Lines       36189    36324     +135     
  Branches     9063     9095      +32     
==========================================
+ Hits        16883    16977      +94     
- Misses      19254    19295      +41     
  Partials       52       52              

Flag	Coverage Δ
unit	46.73% <40.46%> (+0.08%)	⬆️

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Files	Coverage Δ
...s/dashboard-core-plugins/src/panels/ChartPanel.tsx	61.09% <ø> (+0.12%)	⬆️
...ashboard-core-plugins/src/panels/IrisGridPanel.tsx	42.97% <ø> (+0.53%)	⬆️
packages/iris-grid/src/IrisGridModel.ts	30.76% <ø> (ø)
...ckages/iris-grid/src/IrisGridTableModelTemplate.ts	46.28% <100.00%> (ø)
packages/iris-grid/src/IrisGridTestUtils.ts	72.58% <100.00%> (ø)
packages/iris-grid/src/PartitionSelectorSearch.tsx	69.81% <100.00%> (+0.05%)	⬆️
...ode-studio/src/styleguide/MockIrisGridTreeModel.ts	34.75% <0.00%> (ø)
packages/iris-grid/src/IrisGridUtils.ts	57.02% <47.22%> (+1.48%)	⬆️
packages/iris-grid/src/IrisGrid.tsx	27.00% <10.52%> (+0.03%)	⬆️
...ckages/iris-grid/src/IrisGridPartitionSelector.tsx	44.02% <43.02%> (+9.54%)	⬆️

... and 50 files with indirect coverage changes

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[mofojed]

Need to worry about legacy format from dehydrated state, so update that type and handle it correctly in hydrateIrisGridPanelState.

[mofojed]

It looks good, but with the added hydration method and the imperative that we handle legacy data correctly, we need to add unit tests that cover those hydration cases.

[mofojed]

Tests need a bit of cleanup

[mofojed]

These tests don't seem right. A selected partition should have a value for partition,. and the "unselected partition" test - are we testing the empty string? Or isSelectingPartition?

[georgecwan]

I believe that the first test is testing for isSelectingPartition being false (in which case the value of partition) shouldn't matter and the second test is just testing for selecting a partition normally. partition should be null to signify a partition without a value so the second test is just testing for the empty string. I can use a non-empty string to make the test clearer.

[mofojed]

Should have cases for no partition column as well.