Add support for absolute plugin paths

[ygoe]

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:

Description

Plugins can only be specified as package names or relative paths on the command line. This doesn't meet my requirements. When using rollup packaged in my tool application, I need to specify the absolute installation path of a plugin. No other solution will work for me.

I have verified that this change satisfies this requirement in my local installed copy of the code. I don't have any environment for TypeScript or rollup development, so I can only provide the backport of my patched JavaScript source code. I'm unable to provide anything more than this. It's a trivial change though and should be easy to review.

If necessary, I can try to locate the relevant documentation in this repository and update it, too.

[codecov]

Codecov Report

Merging #4533 (43ea735) into master (60806b5) will decrease coverage by 0.02%.
The diff coverage is 33.33%.

❗ Current head 43ea735 differs from pull request most recent head 223ffc7. Consider uploading reports for the commit 223ffc7 to get more accurate results

@@            Coverage Diff             @@
##           master    #4533      +/-   ##
==========================================
- Coverage   98.89%   98.86%   -0.03%     
==========================================
  Files         208      208              
  Lines        7332     7334       +2     
  Branches     2094     2095       +1     
==========================================
  Hits         7251     7251              
- Misses         26       27       +1     
- Partials       55       56       +1     

Impacted Files	Coverage Δ
cli/run/commandPlugins.ts	93.18% <33.33%> (-4.44%)	⬇️

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[lukastaegert]

While the approach looks reasonable, your implementation was referencing a file from the build output, which means subsequent builds would not have worked. Also, you did not add a test (which would have shown that your solution does not work).
I fixed this and extended an existing test to also work on Windows. Also, you should probably use pathToFileUrl instead of just prepending file:// as the latter was failing for me due to wrong path separators.
Please give the branch another go, if CI is green and it works for you I will release this. You should be able to install it and try it out via

npm install ygoe/rollup#patch-1

[ygoe]

I cannot test this because the npm package fails to install. The lenghty error message says something about the command "husky" was not found. I don't know what that means.

[lukastaegert]

I think as CI seems to be happy, I will merge this anyway.