WIP: Protect against brute force (frequent) login attempts (#10031)

* db: add login attempt migrations

* db: add possibility to create login attempts

* db: add possibility to retrieve login attempt count per username

* auth: validation and update of login attempts for invalid credentials

If login attempt count for user authenticating is 5 or more the last 5 minutes
we temporarily block the user access to login

* db: add possibility to delete expired login attempts

* cleanup: Delete login attempts older than 10 minutes

The cleanup job are running continuously and triggering each 10 minute

* fix typo: rename consequent to consequent

* auth: enable login attempt validation for ldap logins

* auth: disable login attempts validation by configuration

Setting is named DisableLoginAttemptsValidation and is false by default
Config disable_login_attempts_validation is placed under security section
#7616

* auth: don't run cleanup of login attempts if feature is disabled

#7616

* auth: rename settings.go to ldap_settings.go

* auth: refactor AuthenticateUser

Extract grafana login, ldap login and login attemp validation together
with their tests to separate files.
Enables testing of many more aspects when authenticating a user.
#7616

* auth: rename login attempt validation to brute force login protection

Setting DisableLoginAttemptsValidation => DisableBruteForceLoginProtection
Configuration disable_login_attempts_validation => disable_brute_force_login_protection
#7616

pkg/models/login_attempt.go

@@ -0,0 +1,36 @@
+package models
+
+import (
+	"time"
+)
+
+type LoginAttempt struct {
+	Id        int64
+	Username  string
+	IpAddress string
+	Created   time.Time
+}
+
+// ---------------------
+// COMMANDS
+
+type CreateLoginAttemptCommand struct {
+	Username  string
+	IpAddress string
+
+	Result LoginAttempt
+}
+
+type DeleteOldLoginAttemptsCommand struct {
+	OlderThan   time.Time
+	DeletedRows int64
+}
+
+// ---------------------
+// QUERIES
+
+type GetUserLoginAttemptCountQuery struct {
+	Username string
+	Since    time.Time
+	Result   int64
+}