Sort manual chunks generated via a function by name

[lukastaegert]

This PR contains:

• bugfix
• feature
• refactor
• documentation
• other

Are tests included?

• yes (bugfixes and features will not be merged without tests)
• no

Breaking Changes?

• yes (breaking changes will not be merged unless absolutely necessary)
• no

List any relevant issue numbers:
Resolves #4394

Description

If a manual chunk function is used, this enforces a sorting order of the generated manual chunks by chunk name to avoid e.g. unintended hash changes.

[github-actions]

Thank you for your contribution! ❤️

You can try out this pull request locally by installing Rollup via

npm install rollup/rollup#gh-4394-sort-manual-chunks

or load it into the REPL:
https://rollupjs.org/repl/?pr=4397

[codecov]

Codecov Report

Merging #4397 (e116fef) into master (5f4d04f) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4397   +/-   ##
=======================================
  Coverage   98.72%   98.73%           
=======================================
  Files         204      204           
  Lines        7320     7325    +5     
  Branches     2080     2081    +1     
=======================================
+ Hits         7227     7232    +5     
  Misses         34       34           
  Partials       59       59           

Impacted Files	Coverage Δ
src/Bundle.ts	100.00% <100.00%> (ø)

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