Update ADR8 (backport #4631) (#4719)

* docs: update ADR8 (#4631)

* update adr8 to latest implementation decisions

* fix link

* fixed relationship between CallbackPacketData and packet data interfaces

* update changelog

* Apply suggestions from code review

Co-authored-by: srdtrk <59252793+srdtrk@users.noreply.github.com>

* fix(docs): fix broken link

* address rest of comments

* Update docs/architecture/adr-008-app-caller-cbs.md

Co-authored-by: srdtrk <59252793+srdtrk@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: srdtrk <59252793+srdtrk@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Jim Fasarakis-Hilliard <d.f.hilliard@gmail.com>
Co-authored-by: srdtrk <59252793+srdtrk@users.noreply.github.com>

---------

Co-authored-by: srdtrk <59252793+srdtrk@users.noreply.github.com>
Co-authored-by: srdtrk <srdtrk@hotmail.com>
Co-authored-by: Jim Fasarakis-Hilliard <d.f.hilliard@gmail.com>
(cherry picked from commit 68f7ab3)

# Conflicts:
#	docs/architecture/README.md

* Update README.md

---------

Co-authored-by: Aditya <adityasripal@gmail.com>

docs/architecture/README.md

@@ -34,6 +34,7 @@ To suggest an ADR, please make use of the [ADR template](./adr-template.md) prov
 | [005](./adr-005-consensus-height-events.md) | `UpdateClient` events - `ClientState` consensus heights | Accepted |
 | [006](./adr-006-02-client-refactor.md) | ICS02 client refactor | Accepted |
 | [007](./adr-007-solomachine-signbytes.md) | ICS06 Solo machine sign bytes |
+| [008](./adr-008-app-caller-cbs.md) | Callback to IBC ACtors | Accepted |
 | [009](./adr-009-v6-ics27-msgserver.md) | ICS27 message server addition | Accepted |
 | [011](./adr-011-transfer-total-escrow-state-entry.md) | ICS20 state entry for total amount of tokens in escrow | Accepted |
 | [015](./adr-015-ibc-packet-receiver.md) | IBC Packet Routing | Accepted |