fix(language-service): use tsLSHost to do module resolution

[kyliau]

This is a patch PR for #32479

This PR fixes a critical performance issue where the language
service makes a MASSIVE number of filesystem calls when performing
module resolution.
This is because there is no caching. To make matters worse, module
resolution is performed for every program change (which means every
few keystrokes trigger a massive number of fs calls).

There are two solutions here:

Provide a cache to ts.resolveModuleName()
Use ts.LanguageServiceHost.resolveModuleNames()
Since every Project (and by extension ConfiguredProject) implements
ts.LanguageServiceHost interface, (2) is the preferred solution here.
i.e. the TypeScript LanguageServiceHost always has the
resolveModuleNames() defined even though it's optional in the interface.

PR Checklist

Please check if your PR fulfills the following requirements:

• The commit message follows our guidelines: https://github.com/angular/angular/blob/master/CONTRIBUTING.md#commit
• Tests for the changes have been added (for bug fixes / features)
• Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• angular.io application / infrastructure changes
• Other... Please describe:

What is the current behavior?

Issue Number: N/A

What is the new behavior?

Does this PR introduce a breaking change?

• Yes
• No

Other information

[matsko]

landed as 1c5b157

[simeyla]

So what does this actually speed up for the average user?

Does this apply to ng serve, building, server side rendering?
Would be helpful to know if it's worth updating just for this. Thx

[ayazhafiz]

@simeyla this applies to the Angular language service, not to any direct Angular compilations. If you would like a faster development experience in an editor that uses the language service (e.g. VSCode with the Angular language service extension), it may be worth updating the language service package.

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