Provide normalized options

[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 #3018

Description

This completely refactors how options are handled internally. Basically there are now two types "NormalizedInputOptions" and "NormalizedOutputOptions" that represent a normalized view of the options with all defaults merged in.
All option validation, option normalization and applicable deprecation warnings have been moved to a central place. Internally, only the normalized options are passed around instead of putting them on various classes such as Graph.

As a positive net effect for end users, the buildStart and renderStart hooks will now receive normalized options as well so there is no reason to hard-code any Rollup defaults in plugins.

[rollup-bot]

Thank you for your contribution! ❤️

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

npm install rollup/rollup#normalize-options

or load it into the REPL:
https://rollupjs.org/repl/?circleci=11418

[codecov]

Codecov Report

Merging #3597 into master will increase coverage by 0.04%.
The diff coverage is 99.09%.

@@            Coverage Diff             @@
##           master    #3597      +/-   ##
==========================================
+ Coverage   96.30%   96.35%   +0.04%     
==========================================
  Files         177      180       +3     
  Lines        6070     6140      +70     
  Branches     1787     1799      +12     
==========================================
+ Hits         5846     5916      +70     
+ Misses        112      111       -1     
- Partials      112      113       +1     

Impacted Files	Coverage Δ
cli/cli.ts	71.42% <ø> (ø)
cli/run/batchWarnings.ts	95.27% <ø> (-2.37%)	⬇️
cli/run/loadConfigFile.ts	95.55% <ø> (ø)
cli/run/loadConfigFromCommand.ts	100.00% <ø> (ø)
src/ast/nodes/ImportExpression.ts	100.00% <ø> (ø)
src/ast/nodes/MemberExpression.ts	98.27% <ø> (ø)
src/finalisers/es.ts	100.00% <ø> (ø)
src/finalisers/index.ts	100.00% <ø> (ø)
src/finalisers/shared/warnOnBuiltins.ts	100.00% <ø> (ø)
src/finalisers/system.ts	97.75% <ø> (ø)
... and 46 more

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