feat(code): Test implementations for mempool, tx batch streaming and value builder

[romac]

No description provided.

[romac]

Looks like the driver_steps_not_proposer_other_height test is now failing, will look into it:

thread 'driver_steps_not_proposer_other_height' panicked at test/tests/driver.rs:1280:49:
execute succeeded: InvalidProposalHeight { proposal_height: Height(2), consensus_height: Height(1) }

[romac]

Oh I guess it's because of the two new assertions (which I have turned into errors to make sure we never panic in the driver just in case). I'll update the test to account for that.

[romac]

I think we should also convert the two new assertions in the consensus actor into proper errors instead of panicking in case they are not met. What do you think @ancazamfir?

[codecov]

Codecov Report

Attention: Patch coverage is 78.82273% with 313 lines in your changes missing coverage. Please review.

Project coverage is 83.83%. Comparing base (74dd726) to head (d4b9f35).

Files	Patch %	Lines
code/actors/src/mempool.rs	50.00%	52 Missing ⚠️
code/gossip-mempool/src/lib.rs	71.52%	43 Missing ⚠️
code/actors/src/consensus.rs	71.57%	29 Missing ⚠️
code/gossip-mempool/src/handle.rs	45.10%	28 Missing ⚠️
code/gossip/src/lib.rs	55.10%	22 Missing ⚠️
code/test/src/block_part.rs	86.75%	20 Missing ⚠️
code/actors/src/gossip_mempool.rs	79.78%	18 Missing ⚠️
code/actors/src/util/value_builder.rs	90.74%	15 Missing ⚠️
code/network-mempool/src/peer_id.rs	0.00%	13 Missing ⚠️
code/cli/src/cmd/start.rs	0.00%	11 Missing ⚠️
... and 14 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #191      +/-   ##
==========================================
- Coverage   86.21%   83.83%   -2.38%     
==========================================
  Files          56       67      +11     
  Lines        3720     4779    +1059     
==========================================
+ Hits         3207     4006     +799     
- Misses        513      773     +260     

Flag	Coverage Δ
integration	83.83% <78.82%> (-2.44%)	⬇️
mbt	17.94% <0.00%> (-2.43%)	⬇️

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