main: allow version metadata to be set

[radeksimko]

This allows us - or more importantly anyone other than us - to set build metadata when building LS.

In particular this allows us to update the community Homebrew formula to help more easily distinguish LS installed from the Homebrew community tap from our own builds - which can be useful when troubleshooting - see e.g. #944 (comment)

https://github.com/Homebrew/homebrew-core/blob/dc4bba37bc14ca0a7796656638d6f4df86cc3e0d/Formula/oras.rb#L21-L25

How to test

go build -ldflags="-s -w -X main.version=0.1.0 -X main.versionMeta=homebrew"

./terraform-ls version
0.1.0-dev+homebrew
platform: darwin/arm64
go: go1.18.2
compiler: gc

./terraform-ls version -json

{
  "version": "0.1.0-dev+homebrew",
  "go": "go1.18.2",
  "os": "darwin",
  "arch": "arm64",
  "compiler": "gc"
}

[jpogran]

🚢

[github-actions]

I'm going to lock this pull request because it has been closed for 30 days ⏳. This helps our maintainers find and focus on the active issues.
If you have found a problem that seems related to this change, please open a new issue and complete the issue template so we can capture all the details necessary to investigate further.