feat: support importmap integrity #424
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This adds support for picking up integrity from the import map itself when polyfilling.
Before this feature is shipped in Chrome, this will mostly be useful for shim mode to ensure full integrity for all modules, but once it ships it allows us to ensure that the polyfill also validates integrities provided via the import map.
This implementation supports integrity in import map extensions with multiple import maps, providing an error when the integrity is overridden so that the first integrity in the import map for a given URL is always authoritative.
Explicit preload and script integrities still override the import map integrity value.
This feature is fully compatible with the existing
enforceIntegrityoption for ensuring that all modules are loaded with integrity.//cc @yoavweiss this can be considered an implementation of the feature