Update gRPC expression / filter / literal structures

[devinrsmith]

As part of #3441, the structures around io.deephaven.api.expression.Expression, io.deephaven.api.filter.Filter, and io.deephaven.api.literal.Literal will be updated to be more inclusive of the types of mappings expected from SQL. Given that the SQL support is currently server-side only, the gRPC translation of these structures was separated out.

[devinrsmith]

During investigation into #4606, noticed that this wasn't actually fixed fully; at least not plumbed through with the java client. See comments for this ticket in BatchTableRequestBuilder.

[devinrsmith]

Currently, the RPC for filtering a table is FilterTableRequest, which is built on top of Condition. This has served the purposes for web UI purposes, but is lacking a tight integration with the io.deephaven.api.filter.Filter APIs. As the java client is becoming more used now, there are some growing pains where we are running into issues with the current implementation (#4748).