Add Terraform support

[pbar1]

Description

Added support for Terraform as a language to be enabled via doom_modules.lua. Terraform is a little weird, as it's Tree-sitter parser is simply hcl (the config language Terraform is written in) - hence the extra logic here.

Type of change

• New feature (non-breaking change which adds functionality)

Checklist

• I have checked contributing guidelines
• I have tested my code

[pbar1]

Hmm - the linter is showing a failure due to a warning, though it's not related to the changed files:

Checking lua/doom/extras/autocmds/init.lua        1 warning

    lua/doom/extras/autocmds/init.lua:169:9: unused variable show_diagnostics_function
Error: unused variable show_diagnostics_function

[NTBBloodbath]

Hey, sorry for the delay in my response.

Thank you so much per adding this, I was also thinking about start learning terraform in a near future so it also comes handy for me haha.

Regarding to linter we can just ignore it because it's not related to PR changes and needs to be fixed externally.

Cheers!