feat: Add embed-widget

[mofojed]

• Loads the widget and displays it if there is a widget plugin that matches
  • Displays an error if no plugin is found that can display the type of widget, or a widget with that name is not found
• Fixes Generic embed widget iframe #1629

Tested by installing the matplotlib, plotly-express python plugins, but only installing the plotly-express JS plugin (not the matplotlib JS plugin). Then ran the following snippet:

from deephaven.column import int_col, string_col
from deephaven.plot import Figure, express as dx
from deephaven import new_table
import matplotlib.pyplot as plt

t = new_table([
    string_col("Categories", ["A", "B", "C"]),
    int_col("Values", [1, 3, 5]),
])

t_rollup = t.rollup(aggs=[], by=["Categories"], include_constituents=True)

fig = Figure().plot_cat(series_name="Test", t=t, category="Categories", y="Values").show()

dx_fig = dx.bar(table=t, x="Categories", y="Values")

import matplotlib.pyplot as plt

mpl_fig = plt.figure()
ax = mpl_fig.subplots()
ax.plot([1, 2, 3, 4], [4, 2, 6, 7])

Then opened up pages to the following URLs to make sure the appeared correctly:

1. http://localhost:4030/?name=t - Table displayed correctly
2. http://localhost:4030/?name=t_rollup - Tree Table displayed correctly
3. http://localhost:4030/?name=fig - Deephaven Figure displayed correctly
4. http://localhost:4030/?name=dx_fig - Plotly-express figure displayed correctly
5. http://localhost:4030/?name=mpl_fig - Error displayed correctly about unknown type
6. http://localhost:4030/?name=err - Timeout error displayed
7. http://localhost:4030/ - Error saying no name provided

[mattrunyon]

Are we planning to keep embed-grid and embed-chart. If not, I'd probably remove in a separate PR. They are redundant although each would have a smaller bundle for initial load

[mattrunyon]

I'm not sure if it would make much difference, but we could add an optional type query param and fallback to the type lookup if it's omitted. Would let us be explicit in Jupyter for a more efficient lookup. Not sure if fetching the exported variable list could be expensive in any situations

[mofojed]

Yea it probably would never be too expensive, but we certainly can add type as an optional param.

[mofojed]

Actually, we can't really save anything here - when we call getObject with just the name/type defined, it still looks up the variable definition object: https://github.com/deephaven/deephaven-core/blob/374188ae166aa202da30e078a78c13334cb683f6/web/client-api/src/main/java/io/deephaven/web/client/api/WorkerConnection.java#L803
If we pass it the instance of the variable definition, we skip up looking up that variable definition: https://github.com/deephaven/deephaven-core/blob/374188ae166aa202da30e078a78c13334cb683f6/web/client-api/src/main/java/io/deephaven/web/client/api/WorkerConnection.java#L789
So providing type can basically just get you in a pickle, if it doesn't match what's on the server, and it's not saving us anything since we need to get the definition anyway.

[codecov]

Codecov Report

Attention: 10 lines in your changes are missing coverage. Please review.

Comparison is base (4c0200e) 46.64% compared to head (e80720b) 46.63%.
Report is 1 commits behind head on main.

Files	Patch %	Lines
packages/plugin/src/WidgetView.tsx	0.00%	9 Missing ⚠️
packages/components/src/ErrorBoundary.tsx	94.44%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1668      +/-   ##
==========================================
- Coverage   46.64%   46.63%   -0.01%     
==========================================
  Files         599      604       +5     
  Lines       36681    36753      +72     
  Branches     9196     9211      +15     
==========================================
+ Hits        17109    17139      +30     
- Misses      19520    19562      +42     
  Partials       52       52              

Flag	Coverage Δ
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