ADR011 light client extraction (first iteration) (#2423)

* Initial draft

* Add object-safety related decisions

* More on object-safety

* Document proposal on downcasting support

* Special case AnyClient removal

* Ideas on splitting work

* Summarize rationale for Any* enums described in ADR003

* Address review feedback

* Apply suggestions from code review

Co-authored-by: Sean Chen <[email protected]>

* Add section on light client registry

* Long-lived branch

* Add section on domain types

* Proposal for handling light client specific code

* ADR table entry

* Add examples for light client specific module code

* Move `ClientState::client_def()` to `ClientReader::client_def()`

* Modify example describing need for client registry

* Add proposal to merge `ClientDef` into `ClientState`

* Add line about client registry reexporting concrete types

* Add .changelog entry

* Fix changelog links

* Add comments about object safe Protobuf trait

* Delete old comment regarding `Header::encode_any()`

Co-authored-by: Sean Chen <[email protected]>

.changelog/unreleased/bug-fixes/ibc/2386-fix-ics20-ds-serde.md

@@ -1,2 +1,2 @@
 - Fix serde implementations for ICS20 packet data structures
-  ([#2330](https://github.com/informalsystems/ibc-rs/issues/2386)).
+  ([#2386](https://github.com/informalsystems/ibc-rs/issues/2386)).

.changelog/unreleased/bug-fixes/ibc/2387-fix-get_channel_escrow_address.md

@@ -1,3 +1,3 @@
 - Remove provided `Ics20Reader::get_channel_escrow_address()` implementation and make `cosmos_adr028_escrow_address()`
   public.
-  ([#2035](https://github.com/informalsystems/ibc-rs/issues/2387))
+  ([#2387](https://github.com/informalsystems/ibc-rs/issues/2387))

.changelog/unreleased/improvements/ibc/2356-adr011.md

@@ -0,0 +1,2 @@
+- Propose ADR011 for light client extraction.
+  ([#2356](https://github.com/informalsystems/ibc-rs/pull/2356)).

docs/architecture/README.md

@@ -25,15 +25,16 @@ To suggest an ADR, please make use of the [ADR template](./adr-template.md) prov
 
 ## Table of Contents
 
-| ADR \# | Description | Status |
-| ------ | ----------- | ------ |
-| [001](./adr-001-repo.md) | Repository structure for `ibc-rs` | Accepted    |
-| [002](./adr-002-ibc-relayer.md) | IBC Relayer in Rust | Accepted |
-| [003](./adr-003-handler-implementation.md) | IBC handlers implementation | Accepted |
-| [004](./adr-004-relayer-domain-decomposition.md) | Relayer domain decomposition | Accepted |
-| [005](./adr-005-relayer-v0-implementation.md) | Relayer v0 implementation | Accepted |
-| [006](./adr-006-hermes-v0.2-usecases.md) | Hermes v0.2.0 Use-Cases | Proposed |
-| [007](./adr-007-error.md) | Error Management | Accepted |
-| [008](./adr-008-ics20-implementation.md)         | ICS20 implementation              | Accepted |
+| ADR \#                                                    | Description                                           | Status   |
+|-----------------------------------------------------------|-------------------------------------------------------|----------|
+| [001](./adr-001-repo.md)                                  | Repository structure for `ibc-rs`                     | Accepted |
+| [002](./adr-002-ibc-relayer.md)                           | IBC Relayer in Rust                                   | Accepted |
+| [003](./adr-003-handler-implementation.md)                | IBC handlers implementation                           | Accepted |
+| [004](./adr-004-relayer-domain-decomposition.md)          | Relayer domain decomposition                          | Accepted |
+| [005](./adr-005-relayer-v0-implementation.md)             | Relayer v0 implementation                             | Accepted |
+| [006](./adr-006-hermes-v0.2-usecases.md)                  | Hermes v0.2.0 Use-Cases                               | Proposed |
+| [007](./adr-007-error.md)                                 | Error Management                                      | Accepted |
+| [008](./adr-008-ics20-implementation.md)                  | ICS20 implementation                                  | Accepted |
 | [009](./adr-009-chain-endpoint-handle-standardization.md) | ChainEndpoint and ChainHandle methods standardization | Accepted |
-| [010](./adr-010-unified-cli-arguments-hermes.md) | Unified approach for CLI arguments for Hermes v1.0.0 | Proposed |
+| [010](./adr-010-unified-cli-arguments-hermes.md)          | Unified approach for CLI arguments for Hermes v1.0.0  | Proposed |
+| [011](./adr-011-light-client-crates-extraction.md)        | Light client crates extraction                        | Proposed |