store userMetadata on write operations

[resulyrt93]

Description

With spark deltalake we can store userMetadata with write operations, thus we can access them in delta history. It can be an arbitrary json data. Is there a way to store it with delta-rs python binding? Doc link

Use Case
In our case, we want to store user data with write operation to match transaction with user.

Related Issue(s)
#133

[ion-elgreco]

Should be trivial to expose, I can take a look at it after new years eve

[r3stl355]

Can userMetadata be added to app_metadata before being passed to commit (unless it is already the same thing and just needs to be exposed to Python)? Adding a new parameter to commit would touch many operations.
I am working on #1957 so can also look into this after I'm done there

[cekicbaris]

this is exactly what we need.
+1

[ion-elgreco]

@r3stl355 it's the same thing, see my PR: #1994

[r3stl355]

cool, so this doesn't touch Rust at all, nice