Add a new lineComments extension for CodeMirror

[VasylMarchuk]

Related to #1231

Brief

This adds a new lineComments extension for CodeMirror, for showing and adding line comments.

Details

TBD

Checklist

• I've thoroughly self-reviewed my changes
• I've added tests for my changes, unless they affect admin-only areas (or are otherwise not worth testing)
• I've verified any visual changes using Percy (add a commit with [percy] in the message to trigger)

[coderabbitai]

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[github-actions]

Test Results

  1 files  ±0    1 suites  ±0   7m 40s ⏱️ -8s
624 tests +2  578 ✅ ±0  45 💤 +1  0 ❌ ±0  1 🔥 +1 
624 runs  +2  577 ✅  - 1  45 💤 +1  1 ❌ +1  1 🔥 +1 

For more details on these errors, see this check.

Results for commit 1439be6. ± Comparison against base commit 01e77ea.

♻️ This comment has been updated with latest results.

[codecov]

❌ 1 Tests Failed:

Tests completed	Failed	Passed	Skipped
579	1	578	45

View the top 1 failed test(s) by shortest run time

Chrome 135.0 Acceptance | view-badges: it renders when all badges are unearned

Stack Traces | 1.23s run time

Promise rejected during "it renders when all badges are unearned": Failed to visit URL '/badges': ChunkLoadError: Loading chunk vendors-assets__route__badges_js failed.
(error: http://localhost:7357/assets/chunk.3208a847fb0336699f6a.js)

PageObject: 'page.visit()'
  Selector: ':first'

To view more test analytics, go to the Test Analytics Dashboard
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[codecov]

Bundle Report

Changes will increase total bundle size by 4.8kB (0.01%) ⬆️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
client-array-push	36.58MB	4.8kB (0.01%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: client-array-push

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
assets/chunk.*.js	3.59kB	2.84MB	0.13%
assets/chunk.*.js	1.05kB	63.23kB	1.69%
assets/chunk.*.js	-82 bytes	26.43kB	-0.31%
assets/chunk.*.js	232 bytes	299.3kB	0.08%

Files in assets/chunk.*.js:

• ./utils/code-mirror-line-comments.ts → Total Size: 2.29kB

• ./utils/code-mirror-line-comments-gutter.ts → Total Size: 3.23kB

• ./utils/code-mirror-line-comments-expanded-plugin.ts → Total Size: 1.68kB

• ./utils/code-mirror-line-comments-widget.ts → Total Size: 3.16kB

Files in assets/chunk.*.js:

• ./routes/demo/code-mirror.ts → Total Size: 1.4kB

• ./controllers/demo/code-mirror.ts → Total Size: 27.87kB

• ./templates/demo/code-mirror.hbs → Total Size: 48.7kB