[v5] [icons] fix static icon component size, remove built-in webpack loaders

[adidahiya]

Fixes #6220

Changes proposed in this pull request:

• fix implementation of size prop for generated icon React components
• fix: reduce bundle size by removing webpack-annotated icon path loaders
  • ⚠️ BREAK: IconLoaderOptions now accepts { loader: "split-by-size" | "all" | IconPathsLoader }
  • These webpack loaders created more bundle size inflation than they're worth because of the auto-generated namespace objects created by webpack to map path module filepaths to their source modules. We can achieve the same behavior as the existing "lazy-once" default by writing our own await import() statements. If users want to customize loading behavior, they can easily specify a custom loader function. Docs have been updated to reflect this

[adidahiya]

Deferring imports of the webpack loaders seems to have helped, as the bulky generated namespace objects are now in separate chunks. But this causes webpack to generate chunks for every possible loading mode, which means many small chunks for icons. This is unnecessary noise that should be avoided when using the default Blueprint APIs:

[adidahiya]

better now:

[adidahiya]

Fix typo

Build artifact links for this commit: documentation | landing | table | demo

This is an automated comment from the deploy-preview CircleCI job.

[adidahiya]

The "lazy-once" API is adding 170kb of "parsed" size to the bundle in a new chunk. Not sure if this is worth it for the default behavior:

... especially since we can emulate this "lazy-once" behavior quite easily ourselves with a couple await import() statements.

[adidahiya]

even better now:

[adidahiya]

Remove built-in webpack loaders

Build artifact links for this commit: documentation | landing | table | demo

This is an automated comment from the deploy-preview CircleCI job.

[adidahiya]

Delete dead code

Build artifact links for this commit: documentation | landing | table | demo

This is an automated comment from the deploy-preview CircleCI job.