Manually handle go-to-definition of local requires

[matthewmcgarvey]

The crystal command doesn't work if the code won't compile as is so this shortcuts the crystal command to go to file definitions for things like:

require "./log"

and

require "../main"

but falls back to the crystal command if it doesn't work

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This is my first time writing any typescript so my code could probably use a lot of work 😄

[faustinoaq]

@matthewmcgarvey Thank you! 💯