Add support for adjusting Synapse rate-limiting configuration

roles/matrix-synapse/templates/synapse/homeserver.yaml.j2

@@ -409,6 +409,7 @@ rc_message_burst_count: {{ matrix_synapse_rc_message_burst_count }}
 #rc_registration:
 #  per_second: 0.17
 #  burst_count: 3
+rc_registration: {{ matrix_synapse_rc_registration|to_json }}
 #
 #rc_login:
 #  address:
@@ -420,30 +421,36 @@ rc_message_burst_count: {{ matrix_synapse_rc_message_burst_count }}
 #  failed_attempts:
 #    per_second: 0.17
 #    burst_count: 3
+rc_login: {{ matrix_synapse_rc_login|to_json }}
 
 # The federation window size in milliseconds
 #
 #federation_rc_window_size: 1000
+federation_rc_window_size: {{ matrix_synapse_federation_rc_window_size }}
 
 # The number of federation requests from a single server in a window
 # before the server will delay processing the request.
 #
 #federation_rc_sleep_limit: 10
+federation_rc_sleep_limit: {{ matrix_synapse_federation_rc_sleep_limit }}
 
 # The duration in milliseconds to delay processing events from
 # remote servers by if they go over the sleep limit.
 #
 #federation_rc_sleep_delay: 500
+federation_rc_sleep_delay: {{ matrix_synapse_federation_rc_sleep_delay }}
 
 # The maximum number of concurrent federation requests allowed
 # from a single server
 #
 #federation_rc_reject_limit: 50
+federation_rc_reject_limit: {{ matrix_synapse_federation_rc_reject_limit }}
 
 # The number of federation requests to concurrently process from a
 # single server
 #
 #federation_rc_concurrent: 3
+federation_rc_concurrent: {{ matrix_synapse_federation_rc_concurrent }}
 
 # Target outgoing federation transaction frequency for sending read-receipts,
 # per-room.
@@ -452,6 +459,7 @@ rc_message_burst_count: {{ matrix_synapse_rc_message_burst_count }}
 # into fewer transactions.
 #
 #federation_rr_transactions_per_room_per_second: 50
+federation_rr_transactions_per_room_per_second: {{ matrix_synapse_federation_rr_transactions_per_room_per_second }}