Add exports exception for loadConfigFile

[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 #4460

Description

As we explicitly state that you can require loadConfigFile without extension in the docs, this will add an explicit exports route for this.

In preparation for the next major release where I would like to remove that hack again, loadConfigFile can now directly be imported as rollup/loadConfigFile as well.

[github-actions]

Thank you for your contribution! ❤️

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

npm install rollup/rollup#gh-4460-rollup-package-exports

or load it into the REPL:
https://rollupjs.org/repl/?pr=4483

[codecov]

Codecov Report

Merging #4483 (beb80ac) into master (edd971e) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #4483   +/-   ##
=======================================
  Coverage   98.75%   98.75%           
=======================================
  Files         205      205           
  Lines        7331     7331           
  Branches     2082     2082           
=======================================
  Hits         7240     7240           
  Misses         33       33           
  Partials       58       58           

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