fix: No context menu item for paste in an input table

[ericlln]

• Added paste as a context menu option in IrisGrid
• Added methods to check for and request clipboard permissions, which are called when clicking paste in context menu
• For browsers that support the clipboard-read permission (e.g. Chrome), clicking paste results in the same behaviour as pressing the keyboard shortcut, provided the user has accepted the request for permission
• For browsers that don't support the clipboard-read permission (e.g. Firefox and Safari), a modal is shown to explain the reason and to suggest using the keyboard shortcut instead

Additional related issues fixed

• Show relevant warning when attempting to paste too many columns into input table
• Fixed copy and pasting between Deephaven tables on Firefox. The issue is caused by tabs in pasted content being converted to     instead of      which we were expecting before. Was able to reproduce former behaviour on an older build of Firefox (91.0), meaning this discrepancy is likely caused by an update to Firefox (unsure when exactly)

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 14 lines in your changes missing coverage. Please review.

Project coverage is 46.71%. Comparing base (5f6c8d6) to head (d29409e).

Files with missing lines	Patch %	Lines
...d/src/mousehandlers/IrisGridContextMenuHandler.tsx	0.00%	8 Missing ⚠️
packages/iris-grid/src/IrisGrid.tsx	20.00%	4 Missing ⚠️
packages/grid/src/Grid.tsx	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2341      +/-   ##
==========================================
+ Coverage   46.70%   46.71%   +0.01%     
==========================================
  Files         704      706       +2     
  Lines       39044    39084      +40     
  Branches     9757     9950     +193     
==========================================
+ Hits        18234    18260      +26     
- Misses      20799    20813      +14     
  Partials       11       11              

Flag	Coverage Δ
unit	46.71% <66.66%> (+0.01%)	⬆️

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