Stable base Athena POC integration (take 2)

[lrettig]

Replaces #6180

Motivation

Quick-and-dirty Athena POC integration, sufficient to run a go-spacemesh-based testnet with Athena as its only VM.

Description

• brings in compiled Athena module
• adds an Athena-based vm module
• augments the existing account data type with 32-byte key/value storage slots

Non-goals: This POC is not intended to be merged into mainline go-spacemesh. It's not intended to be kept fully up to date with go-spacemesh fixes and releases, as it's only intended for testnet usage. We don't intend to maintain the existing genvm in this branch.

Test Plan

tbd

TODO

• Explain motivation or link existing issue(s)
• Test changes and document test plan
• Update documentation as needed
• Update changelog as needed

[codecov]

Codecov Report

Attention: Patch coverage is 26.86567% with 588 lines in your changes missing coverage. Please review.

Please upload report for BASE (athena-poc@ad1026d). Learn more about missing BASE report.

Files with missing lines	Patch %	Lines
vm/vm.go	7.1%	313 Missing ⚠️
vm/rewards.go	0.0%	63 Missing ⚠️
vm/core/context.go	58.8%	49 Missing and 9 partials ⚠️
vm/sdk/wallet/tx.go	0.0%	39 Missing ⚠️
vm/templates/wallet/handler.go	16.6%	20 Missing ⚠️
vm/host.go	69.6%	16 Missing and 1 partial ⚠️
vm/core/gas.go	0.0%	13 Missing ⚠️
sql/accounts/accounts.go	63.6%	8 Missing and 4 partials ⚠️
vm/templates/wallet/wallet.go	54.5%	10 Missing ⚠️
vm/core/hash.go	35.7%	9 Missing ⚠️
... and 6 more

Additional details and impacted files

@@             Coverage Diff              @@
##             athena-poc   #6379   +/-   ##
============================================
  Coverage              ?   80.3%           
============================================
  Files                 ?     328           
  Lines                 ?   35765           
  Branches              ?       0           
============================================
  Hits                  ?   28752           
  Misses                ?    5153           
  Partials              ?    1860           

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[poszu]

LGTM! Left some nits