feat: add epoch 3.4 and Clarity5

[brice-stacks]

Description

Preparing for epoch 3.4 to activate Clarity5. The implementation work is still in progress, and so is the SIP, but I wanted to get this part out of the way.

Applicable issues

Additional info (benefits, drawbacks, caveats)

Checklist

• Test coverage for new or modified code paths
• Changelog is updated
• Required documentation changes (e.g., docs/rpc/openapi.yaml and rpc-endpoints.md for v2 endpoints, event-dispatcher.md for new events)
• New clarity functions have corresponding PR in clarity-benchmarking repo

[brice-stacks]

TODOs once everything is implemented:

• Set latest() in clarity/src/vm/version.rs
• Set latest() in stacks-common/src/types/mod.rs
• Set PEER_NETWORK_EPOCH in stacks-common/src/libcommon.rs
• Set DEFAULT_CLI_EPOCH in contrib/clarity-cli/src/lib.rs

[codecov]

Codecov Report

❌ Patch coverage is 4.81651% with 415 lines in your changes missing coverage. Please review.
✅ Project coverage is 28.16%. Comparing base (4f535d8) to head (6a8c1d5).

Files with missing lines	Patch %	Lines
stackslib/src/core/mod.rs	0.75%	262 Missing ⚠️
clarity/src/vm/tests/crypto.rs	0.00%	26 Missing ⚠️
stackslib/src/chainstate/tests/mod.rs	0.00%	20 Missing ⚠️
stackslib/src/clarity_vm/clarity.rs	0.00%	17 Missing ⚠️
clarity/src/vm/ast/mod.rs	0.00%	13 Missing ⚠️
stacks-common/src/types/mod.rs	38.09%	13 Missing ⚠️
clarity/src/vm/tests/mod.rs	0.00%	11 Missing ⚠️
stackslib/src/chainstate/tests/consensus.rs	0.00%	8 Missing ⚠️
...lib/src/chainstate/tests/runtime_analysis_tests.rs	0.00%	6 Missing ⚠️
clarity/src/vm/version.rs	0.00%	5 Missing ⚠️
... and 16 more

❌ Your project check has failed because the head coverage (28.16%) is below the target coverage (80.00%). You can increase the head coverage or adjust the target coverage.

❗ There is a different number of reports uploaded between BASE (4f535d8) and HEAD (6a8c1d5). Click for more details.

HEAD has 9 uploads less than BASE

Flag	BASE (4f535d8)	HEAD (6a8c1d5)
	82	73

Additional details and impacted files

@@             Coverage Diff              @@
##           develop    #6802       +/-   ##
============================================
- Coverage    77.77%   28.16%   -49.62%     
============================================
  Files          585      585               
  Lines       361916   362262      +346     
============================================
- Hits        281498   102043   -179455     
- Misses       80418   260219   +179801     

Files with missing lines	Coverage Δ
clarity-types/src/types/signatures.rs	62.95% <100.00%> (-29.39%)	⬇️
clarity/src/vm/analysis/mod.rs	66.31% <ø> (-26.32%)	⬇️
clarity/src/vm/analysis/type_checker/mod.rs	93.75% <100.00%> (ø)
...rity/src/vm/analysis/type_checker/v2_1/contexts.rs	68.77% <100.00%> (-31.23%)	⬇️
...c/vm/analysis/type_checker/v2_1/tests/contracts.rs	0.00% <ø> (-95.76%)	⬇️
clarity/src/vm/tests/post_conditions.rs	0.00% <ø> (-97.06%)	⬇️
clarity/src/vm/tests/proptest_utils.rs	0.00% <ø> (-74.27%)	⬇️
stacks-common/src/libcommon.rs	0.00% <ø> (-75.00%)	⬇️
.../chainstate/burn/operations/leader_block_commit.rs	15.71% <ø> (-79.80%)	⬇️
stackslib/src/chainstate/coordinator/mod.rs	73.93% <ø> (-1.63%)	⬇️
... and 29 more

... and 487 files with indirect coverage changes

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