feat: add ldap support (#232)

* feat: add ldap support

* feat: add insecure option for self-signed certificates

* fix: recognize ldap as a username provider

* test: fix tests

* feat: add configurable search filter

* fix: fix error message in ldap search result

* refactor: bot suggestions

internal/types/types.go

@@ -12,6 +12,12 @@ type User struct {
 	TotpSecret string
 }
 
+// UserSearch is the response of the get user
+type UserSearch struct {
+	Username string
+	Type     string // "local", "ldap" or empty
+}
+
 // Users is a list of users
 type Users []User