Supersede ClientState proof verification methods with generic inter…

…faces (#531)

* Supersede ClientState proof verification methods with generic interfaces

* add changelog entry

* Inline tendermint verify_(non)_membership impls

* Move height verifications to appropriate places

* Fix verify_* comments

* Fix tests

* Remove Seq & ConsState conversions

* Fix no-std

* Fix ChannelEnd error comment

* Add client_state frozen check for chan_open/close_init

* Rename assert_not_frozen and make it abstract

* Fix chan_open_init unit tests

* remove extra block

* changelog 545

* Remove frozen_height interface

* Add missed client frozen checks

* Add proto_encode_vec

---------

Co-authored-by: Philippe Laferriere <[email protected]>

.changelog/unreleased/breaking-changes/530-generic-proof-verification-interface.md

@@ -0,0 +1,3 @@
+- Replace specific verify_functions inside `ics02_client` with generic
+  `verify_membership` and `verify_non_membership` interfaces.
+  ([#530](https://github.com/cosmos/ibc-rs/issues/530))

.changelog/unreleased/breaking-changes/545-improve-clientstate-is_frozen.md

@@ -0,0 +1,3 @@
+- Replace `ClientState::frozen_height()` and `ClientState::is_frozen()`
+  with `ClientState::confirm_frozen()`
+  ([#545](https://github.com/cosmos/ibc-rs/issues/545))