tools/linters: convert to LinterPlugin implementation

This commit introduces the `LLPlugin` type and converts the existing lll
code such that the LLPlugin implements the register.LinterPlugin
interface. This will allow us to plug it into golangci-linter as a
plugin.

tools/linters/go.mod

@@ -3,42 +3,13 @@ module github.com/lightningnetwork/lnd/tools/linters
 go 1.22.6
 
 require (
-	github.com/golangci/golangci-lint v1.62.2
+	github.com/golangci/plugin-module-register v0.1.1
 	github.com/stretchr/testify v1.10.0
 	golang.org/x/tools v0.27.0
 )
 
 require (
 	github.com/davecgh/go-spew v1.1.1 // indirect
-	github.com/fatih/color v1.18.0 // indirect
-	github.com/fsnotify/fsnotify v1.5.4 // indirect
-	github.com/go-viper/mapstructure/v2 v2.2.1 // indirect
-	github.com/hashicorp/go-version v1.7.0 // indirect
-	github.com/hashicorp/hcl v1.0.0 // indirect
-	github.com/ldez/gomoddirectives v0.2.4 // indirect
-	github.com/magiconair/properties v1.8.6 // indirect
-	github.com/mattn/go-colorable v0.1.13 // indirect
-	github.com/mattn/go-isatty v0.0.20 // indirect
-	github.com/mitchellh/go-homedir v1.1.0 // indirect
-	github.com/mitchellh/mapstructure v1.5.0 // indirect
-	github.com/pelletier/go-toml v1.9.5 // indirect
-	github.com/pelletier/go-toml/v2 v2.2.3 // indirect
 	github.com/pmezard/go-difflib v1.0.0 // indirect
-	github.com/rogpeppe/go-internal v1.13.1 // indirect
-	github.com/sirupsen/logrus v1.9.3 // indirect
-	github.com/spf13/afero v1.11.0 // indirect
-	github.com/spf13/cast v1.5.0 // indirect
-	github.com/spf13/jwalterweatherman v1.1.0 // indirect
-	github.com/spf13/pflag v1.0.5 // indirect
-	github.com/spf13/viper v1.12.0 // indirect
-	github.com/stretchr/objx v0.5.2 // indirect
-	github.com/subosito/gotenv v1.4.1 // indirect
-	golang.org/x/exp v0.0.0-20240909161429-701f63a606c0 // indirect
-	golang.org/x/mod v0.22.0 // indirect
-	golang.org/x/sync v0.9.0 // indirect
-	golang.org/x/sys v0.27.0 // indirect
-	golang.org/x/text v0.18.0 // indirect
-	gopkg.in/ini.v1 v1.67.0 // indirect
-	gopkg.in/yaml.v2 v2.4.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )