More packages, more monorepo

We are moving the @bazel/typescript and @bazel/karma packages to this repo from rules_typescript.

This makes it easier for us to do maintenance work in a single monorepo. rules_typescript is now just some utility bits that are shared with google internal, and we get them as a WORKSPACE dependency here.

Note, we are burning minor revisions 19-25 because we want to catch up to the versions from the rules_typescript repo so that these two packages keep monotonic increased version numbers.

There are now several npm packages published from this repo:

@bazel/bazel
-------
latest: 0.22.0
next: 0.23.0-rc1b

@bazel/ibazel
-------
latest: 0.9.1

@bazel/buildifier
-------
latest: 0.22.0

@bazel/karma
-------
latest: 0.25.1
next: 0.26.0-beta.0

@bazel/typescript
-------
latest: 0.25.1
next: 0.26.0-beta.0

@bazel/jasmine
-------
latest: 0.18.7
next: 0.26.0-beta.0