Interpret Starlark Code

[josiahsrc]

We need to interpret starlark source code so we can provide autocompletion. Either using Go or Java, doesn't matter.

General tasks

• Load function definitions for rules
• Interpret attributes for any bazel rule based on the definition
• Parse the starlark code so we can find load statements, rules, function calls, etc...

This task may take more than one sprint. Bare bones, we need to figure out how to do the things listed in the items above.

[josiahsrc]

Just parse the starlark and show errors (starlark syntax only)