test: add some basic e2e tests

[Boshen]

./test.sh currently errors with

fatal error: all goroutines are asleep - deadlock!

---

It doesn't seem to work with other .ts file extensions found in real projects:

panic: ScriptKind must be specified when parsing source files.

goroutine 4442 [running]:
github.com/microsoft/typescript-go/internal/parser.(*Parser).initializeState(0x101bd3c20?, {{0x1400001a640, 0x41}, {0x14005e6d7c0, 0x41}, {0x0, 0x0, 0x0, 0x0}, {0x1, ...}, ...}, ...)

Question: should js extensions be allowed as well?

[auvred]

It doesn't seem to work with other .ts file extensions found in real projects:

Fixed 16b391f

[auvred]

Question: should js extensions be allowed as well?

https://typescript-eslint.io/blog/project-service#additional-files

It's often desirable to lint .js files using type-aware rules - especially *.config.js files and misc scripts written in JS.

[Boshen]

Everything worked! I'll continue add more tests to this branch, until we have proper e2e test setup.

[Boshen]

Merging to keep the ball rolling. Need to setup a proper e2e test suite in go at some point.