feat(lsp): Support gotoDefinition from go->templ

[tris203]

Support goToDefinition from a go file to a templ file.

Steps to test:

1. Attach both gopls and templ lsp to a main.go buffer
2. GoToDefinition
3. Profit

Caveats, because gopls and templ are attached, both references will be returned. Editor settings can be used to set preference to select from a list or go to the preferred option (probably the templ file)

When and if this was merged, it would need further adjustments to neovim/lspconfig to attach templ to go files too and would probably need a change in the vscode extension for the same

Closes #387