feat(go): add linting with golangci-lint (#6311)

## Description

<!-- Describe the big picture of your changes to communicate to the
maintainers
  why we should accept this pull request. -->

Add Go linting support using
[golangci-lint](https://github.com/golangci/golangci-lint) and
nvim-lint.

- Installs golangci-lint via Mason.
- Configures nvim-lint to run it on Go files.

This improves the Go development experience by running a fast, popular
linter automatically

## Related Issue(s)

<!--
  If this PR fixes any issues, please link to the issue here.
  - Fixes #<issue_number>
-->

None

## Screenshots

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## Checklist

- [x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/plugins/extras/lang/go.lua

@@ -97,6 +97,22 @@ return {
       })
     end,
   },
+  -- Add linting
+  {
+    "mfussenegger/nvim-lint",
+    optional = true,
+    dependencies = {
+      {
+        "mason-org/mason.nvim",
+        opts = { ensure_installed = { "golangci-lint" } },
+      },
+    },
+    opts = {
+      linters_by_ft = {
+        go = { "golangcilint" },
+      },
+    },
+  },
   {
     "stevearc/conform.nvim",
     optional = true,