build: configure golangci-lint with custom rules and exclusions

- Add golangci-lint configuration with a custom set of enabled linters and formatters
- Exclude generated files and specific directories from linting and formatting

Signed-off-by: Bo-Yi Wu <appleboy.tw@gmail.com>

.golangci.yml

@@ -0,0 +1,51 @@
+version: "2"
+linters:
+  default: none
+  enable:
+    - bodyclose
+    - dogsled
+    - dupl
+    - errcheck
+    - exhaustive
+    - gochecknoinits
+    - goconst
+    - gocritic
+    - gocyclo
+    - goprintffuncname
+    - gosec
+    - govet
+    - ineffassign
+    - lll
+    - misspell
+    - nakedret
+    - noctx
+    - nolintlint
+    - rowserrcheck
+    - staticcheck
+    - unconvert
+    - unparam
+    - unused
+    - whitespace
+  exclusions:
+    generated: lax
+    presets:
+      - comments
+      - common-false-positives
+      - legacy
+      - std-error-handling
+    paths:
+      - third_party$
+      - builtin$
+      - examples$
+formatters:
+  enable:
+    - gofmt
+    - gofumpt
+    - goimports
+    - golines
+  exclusions:
+    generated: lax
+    paths:
+      - third_party$
+      - builtin$
+      - examples$