feat: implement receive packet

[shanithkk]

Description:

As a developer, I want to be able to receive packets from the counterparty using the recvPacket function, and handle them appropriately, such as by acknowledging receipt or retransmitting them if necessary.

Commit Message

feat: implement receive packet

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Checklist:

• I have performed a self-review of my own code
• I have documented my code in accordance with the documentation guidelines
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• I have run the unit tests
• I only have one commit (if not, squash them into one commit).
• I have a descriptive commit message that adheres to the commit message guidelines

Please review the CONTRIBUTING.md file for detailed contributing guidelines.

[codecov-commenter]

Codecov Report

Merging #271 (d6e46bd) into main (9660970) will increase coverage by 1.37%.
The diff coverage is 73.12%.

@@            Coverage Diff             @@
##             main     #271      +/-   ##
==========================================
+ Coverage   44.85%   46.23%   +1.37%     
==========================================
  Files          90       91       +1     
  Lines       14595    14941     +346     
==========================================
+ Hits         6547     6908     +361     
+ Misses       8048     8033      -15     

Impacted Files	Coverage Δ
...osmwasm-vm/cw-ibc-core/src/ics04_channel/packet.rs	0.00% <ø> (ø)
contracts/cosmwasm-vm/cw-ibc-core/src/lib.rs	3.22% <ø> (ø)
contracts/cosmwasm-vm/cw-ibc-core/src/msg.rs	20.00% <ø> (ø)
...bc-core/src/ics04_channel/packet/recieve_packet.rs	72.80% <72.80%> (ø)
contracts/cosmwasm-vm/cw-ibc-core/src/types.rs	79.85% <100.00%> (+0.19%)	⬆️

... and 2 files with indirect coverage changes

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