feat: AG Grid Plugin basic implementation (#1141)

- Basic AG Grid implementation. This is a launching point for a
`deephaven-plugin-aggrid`, and an example of hooking up a Deephaven
table with AG Grid
  - We'll add more functionality as we progress
- An example of both a Server-Side Datasource and a Viewport Datasource
  - We'll probably end up sticking with the Server-Side Datasource
- Server-Side Datasource has two subscriptions: one for getRows, and one
for the users current viewport
      - Listens for updates, and then updates the data within AG Grid
- Tested by including `ag-grid` as a flag on the
`tools/plugin_builder.py` command, then running a snippet to display
some tables in AG Grid:
```python
from deephaven import empty_table, new_table
from deephaven.column import string_col, double_col
from deephaven.ag_grid import AgGrid
from deephaven.plot import express as dx

_result = new_table(
    [
        double_col("Doubles", [3.1, 5.45, -1.0]),
        string_col("Strings", ["Creating", "New", "Tables"]),
    ]
)
_stocks = dx.data.stocks()

ag_result = AgGrid(_result)
ag_stocks = AgGrid(_stocks)
ag_stocks_tail = AgGrid(_stocks.tail(5))
ag_huge_table = AgGrid(empty_table(100_000_000).update_view(["x=i", "y=Math.sin(x)"]))
```
Grids appeared correctly.
- Next steps: Wire up unit tests, then look more into the data sources
(server side row data source vs. viewport row data source) to see which
is more powerful/achieves what we want. Viewport was easy to wire up but
I think SSR seems to have more methods/options available

---------

Co-authored-by: Matthew Runyon <matthewrunyon@deephaven.io>

Author: mofojed

package-lock.json

@@ -0,0 +1,8 @@
+build/
+dist/
+.venv/
+/venv
+*.egg-info/
+.idea
+.DS_store
+__pycache__/