feat: add welcome message functionality

- Introduced a new welcome service and repository for managing welcome messages, channels, and GIFs.
- Added commands to set welcome channel, message, DM, and GIF through the bot's configuration.
- Implemented event handling for new guild members to send welcome messages and DMs based on configuration.
- Updated main application to include the new welcome service in the bot's services.

internal/db/services/services.go

@@ -9,6 +9,7 @@ import (
 	"velox-bot/internal/db/services/schedule"
 	"velox-bot/internal/db/services/twitch"
 	"velox-bot/internal/db/services/usersettings"
+	"velox-bot/internal/db/services/welcome"
 )
 
 type Services struct {
@@ -20,11 +21,12 @@ type Services struct {
 	Projects      *projects.Service
 	RPS           *rps.Service
 	Twitch        *twitch.Service
+	Welcome       *welcome.Service
 }
 
 var Global *Services
 
-func NewServices(level *level.Service, levelSettings *levelsettings.Service, meeting *meeting.Service, schedule *schedule.Service, userSettings *usersettings.Service, projects *projects.Service, rps *rps.Service, twitchSvc *twitch.Service) *Services {
+func NewServices(level *level.Service, levelSettings *levelsettings.Service, meeting *meeting.Service, schedule *schedule.Service, userSettings *usersettings.Service, projects *projects.Service, rps *rps.Service, twitchSvc *twitch.Service, welcomeSvc *welcome.Service) *Services {
 	s := &Services{
 		Level:         level,
 		LevelSettings: levelSettings,
@@ -34,6 +36,7 @@ func NewServices(level *level.Service, levelSettings *levelsettings.Service, mee
 		Projects:      projects,
 		RPS:           rps,
 		Twitch:        twitchSvc,
+		Welcome:       welcomeSvc,
 	}
 	Global = s
 	return s