feat: add fork remote command

The command allows you to quickly add a fork remote by replacing the owner in the origin URL and optionally check out a branch from new remote.

pkg/config/user_config.go

@@ -529,6 +529,7 @@ type KeybindingBranchesConfig struct {
 	PushTag                string `yaml:"pushTag"`
 	SetUpstream            string `yaml:"setUpstream"`
 	FetchRemote            string `yaml:"fetchRemote"`
+	AddForkRemote          string `yaml:"addForkRemote"`
 	SortOrder              string `yaml:"sortOrder"`
 }
 
@@ -985,6 +986,7 @@ func GetDefaultConfig() *UserConfig {
 				PushTag:                "P",
 				SetUpstream:            "u",
 				FetchRemote:            "f",
+				AddForkRemote:          "F",
 				SortOrder:              "s",
 			},
 			Worktrees: KeybindingWorktreesConfig{