* Refactor of FilterV2 subscription handling and maintenance with addition subscription time-to-live support.
Fixed all tests and reworked where subscription handling changes needed it.
Adapted REST API /admin filter subscription retrieve to new filter subscription structure.
* Fix tests and PR comments
* Added filter v2 subscription timeout tests and fixed
* Fix review comments and suggestions. No functional change.
* Remove leftover echoes from test_rest_admin
* Fix failed legacy filter tests due to separation of mounting the filters.
* Small fixes, fix naming typo, removed duplicated checks in test
* message.nim: set max message size to 150KiB according to spec
Using KiB instead of KB because that seems more aligned with
the actual default defined in nim-libp2p (1024 * 1024)
Spec details: https://rfc.vac.dev/spec/64/#message-size
* test_protocol.nim: align test to current WakuMessage limit
* test_waku_client.nim: adapt test to MaxWakuMessageSize change
* make maxMessageSize configurable for wakunode2
* wakunode2 app now accepts max-num-bytes-msg-size with KiB, KB, or B units
* testlib/wakunode.nim: set maxMessageSize: "1024 KiB"
* test_waku_client.nim: remove duplicate check in "Valid Payload Sizes"
* set DefaultMaxWakuMessageSizeStr as the only source of truth
* external_config.nim: rename max-num-bytes-msg-size -> max-msg-size