Add extra features to plugin

[ingwarsw]

Basic features added:

• Fixed function names colors
• Some extra colors in highlighter
• Add commenter
• Added completion (works for targets and functions)
• Added go to definition/usage (works for targets and functions)
• Added find usages (works for targets and functions)
• Working refactoring (works for targets and functions)
• Added custom name validator to validate targets and function names properly

Extras:

• Added basic parsing tests
• Upgraded requirement to 2023.2.6 (maybe we can lower it to 2022.1, but upgrade was needed)
• Upgraded java to 17
• Added test pipeline for PRs

Needs first merge https://github.com/earthly/earthfile-grammar/pull/11

Things I was not able to do:

• Full parsing support NOT WORKING, maybe in the future will be usefull see (tried to migrate to antlr support for exactly same parser as Earthly is using internally see #35)

[CLAassistant]

All committers have signed the CLA.

[idelvall]

Thanks for the effort Karol, it's looking promising. What do you mean by "Full parsing support NOT WORKING"?

[ingwarsw]

In IDE parser will not tell you that you have error at that line.. or your missing something somewhere.. according to parsing rules..

To test I just added one rule that checks if function test with : (but thats the only rule, and to add all others manually i would spend ages), automatic attempt failed here.

Example parsing error looks like that

[idelvall]

I see. We need this working before merging. If you can do it that would be ideal, otherwise it might take some time for me to be able to focus on this

[ingwarsw]

@idelvall Moved all here.. its much much much simpler now..

[ingwarsw]

@idelvall Is there anything I could help with? Maybe we could just do quick meeting to talk about it and then would be easier to decide..

If your not planning releasing it maybe I can release it myself..