fix(@schematics/angular): remove tsquery peer dependency warning

[clydin]

Replaces the usage of the tsquery package with a conditional based on TypeScript helper functions. Since a TypeScript-subset is vendored within the package, a TypeScript peer dependency cannot be met even though the functionality is present.

Fixes #14270

[alexeagle]

another option would be to vendor tsquery into the package as well. If we thought the library will be useful for writing future migrations or checks, we might want to have it around?

also relates to Igor's suggestion that we have a package used by migrations so they only ever need that one dep. He worries that with things like @angular/core adding migrations, we end up with tooling deps in a lot of third-party libraries

@phenomnomnominal FYI

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