Trusty rule type should support rust and java

[ethomson]

The Trusty PR rule type only supports npm, pypi, and go.

      ecosystems:
        - name: npm
          depfile: package-lock.json
        - name: pypi
          depfile: requirements.txt
        - name: go
          depfile: go.mod

We should support Java and Rust.

[evankanderson]

This will need the ability to parse the relevant dependency files for Java and Rust in Golang.

[evankanderson]

The work on dependencies and diffs should resolve this.