[DESK-23336] bridgev2: add min/max length hints to login input fields

bridgev2/login.go

@@ -314,6 +314,9 @@ type LoginInputDataField struct {
 	DefaultValue string `json:"default_value,omitempty"`
 	// A regex pattern that the client can use to validate input client-side.
 	Pattern string `json:"pattern,omitempty"`
+	// Minimum and maximum input length as a hint for the client
+	MinLength int `json:"min_length,omitzero"`
+	MaxLength int `json:"max_length,omitzero"`
 	// For fields of type select, the valid options.
 	// Pattern may also be filled with a regex that matches the same options.
 	Options []string `json:"options,omitempty"`

bridgev2/matrix/provisioning.yaml

@@ -883,6 +883,12 @@ components:
                       type: string
                       format: regex
                       description: A regular expression that the field value must match.
+                    min_length:
+                      type: integer
+                      description: Minimum input length as a hint for the client.
+                    max_length:
+                      type: integer
+                      description: Maximum input length as a hint for the client.
                     options:
                       type: array
                       description: For fields of type select, the valid options.