feat: Skeleton code for introducing new network messages for requesting contract code

[tayfunelmas]

Sending this early to get feedback. Currently only introduces the messages for requesting the contract code for a set of AccountIds and and responding with the code.

Added the handlers to the ClientActor for now. Will try to implement the handlers and it will make it clear where the handlers belong to.

Current thinking is as follows:
Phase 1.a:

• When the chunk validator detects a contract whose code is not available, it sends a request to one of the nodes that track the respective shard. The node receiving the request responds with the code.
• When the chunk validator receives the code, it starts compilation in the background. The compilation result is saved in the code cache. Note that it will miss the validation in this phase.

Phase 1.b:

• Figure out a way to block the execution of the receipt while the contract code is retrieved from the network, compile it, and continue the execution. Note that this may turn out to be too expensive in time, so the node may miss the validation anyways.

Phase 2:

• Validator node identifies the contracts that will be needed soon (eg. the node will validate shard 2 in the next epoch and starts requesting code for the relevant contracts from that shard).
• The goal is to make sure while validating the chunk the validator already has 100% of the contracts already compiled.

Issue: #11099

[codecov]

Codecov Report

Attention: Patch coverage is 10.52632% with 34 lines in your changes missing coverage. Please review.

Project coverage is 71.07%. Comparing base (a1a01b4) to head (ef19f1e).
Report is 623 commits behind head on master.

Files with missing lines	Patch %	Lines
chain/client/src/contract_code_sync_handler.rs	0.00%	12 Missing ⚠️
chain/client/src/test_utils/test_loop.rs	0.00%	6 Missing ⚠️
chain/network/src/network_protocol/mod.rs	0.00%	6 Missing ⚠️
chain/client/src/client_actions.rs	0.00%	4 Missing ⚠️
core/primitives/src/contract_code_sync.rs	0.00%	3 Missing ⚠️
tools/chainsync-loadtest/src/network.rs	0.00%	2 Missing ⚠️
core/primitives-core/src/version.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #11117      +/-   ##
==========================================
- Coverage   71.10%   71.07%   -0.03%     
==========================================
  Files         772      774       +2     
  Lines      153724   153760      +36     
  Branches   153724   153760      +36     
==========================================
- Hits       109298   109285      -13     
- Misses      39976    40025      +49     
  Partials     4450     4450              

Flag	Coverage Δ
backward-compatibility	0.24% <0.00%> (-0.01%)	⬇️
db-migration	0.24% <0.00%> (-0.01%)	⬇️
genesis-check	1.43% <0.00%> (-0.01%)	⬇️
integration-tests	36.89% <10.52%> (+0.01%)	⬆️
linux	69.49% <10.52%> (-0.02%)	⬇️
linux-nightly	70.56% <10.52%> (-0.05%)	⬇️
macos	54.22% <10.52%> (-0.03%)	⬇️
pytests	1.66% <0.00%> (-0.01%)	⬇️
sanity-checks	1.44% <0.00%> (-0.01%)	⬇️
unittests	66.72% <10.52%> (-0.04%)	⬇️
upgradability	0.29% <0.00%> (-0.01%)	⬇️

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