Add initWidth argument to colDef

[nteetor]

Description

This PR adds an initWidth column to the colDef function. As described in #223 and #374 there isn't currently a way to specify a column's initial width and allow column resizing.

I adjusted the javascript column logic to set width to initWidth, if specified. The behavior of the other width arguments remain unchanged.

Changes

• Added initWidth argument to colDef()
• Added argument checks in colDef() for the following,
  • initWidth is null or numeric
  • initWidth and width cannot both be specified
  • if specified, initWidth is greater than or equal to minWidth
  • if specified, initWidth is less than or equal to minWidth
• Added R tests
  • confirm argument checks listed above
• Added Javascript tests
  • confirm initial width does not affect min or max width
  • initial width leaves a resizable column as resizable

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.47%. Comparing base (9b7b409) to head (8296117).
⚠️ Report is 78 commits behind head on main.
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Additional details and impacted files

@@ Coverage Diff @@## main #425 +/- ##
==========================================
- Coverage 95.88% 92.47% -3.42% 
==========================================
Files 11 19 +8 Lines 1191 2471 +1280 Branches 0 733 +733 ==========================================
+ Hits 1142 2285 +1143 - Misses 49 160 +111 - Partials 0 26 +26 

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[glin]

Looks good, thanks. I'll follow up with a NEWS Item too, but won't/can't push to your main branch:

• colDef() gains an initWidth argument to set a column's initial width in pixels while keeping the column resizable. Unlike width, which sets a fixed width and disables resizing, initWidth only sets the starting width, so the column can still be resized within its minWidth and maxWidth. (@nteetor, #223, #374)

edit: done in 4a43839

[nteetor]

Great news, thank you, @glin!