Moves the `src/tools` folder of the `@angular/localize` package into the
top-level of the package. This is in preparation of actually exposing an
entry-point for the tools that can be accessed using
`@angular/localize/tools`.
We want to expose such an entry-point because the CLI currently
deep-imports into various places of the tools, but this will not
work well with strict ESM because the localize tool depends on the
v13 strict ESM packages like the `@angular/compiler` or
`@angular/compiler-cli`.
PR Close#43431
