feat(kurtosis-devnet): user devnets

[sigma]

Description

This change is an attempt at bridging the gap between kurtosis devnets
and future alphanet/betanet specification.
(see ethereum-optimism/devnets#4)

It does so by defining specific override points in a more generic
template.
Generic building blocks are defined in templates/, and rely on a new
"include" capability at the template level.
See foo-user.example.json for an example.

This approach might also provide a somewhat lighter entry point for
user devnet definitions, following the same principle.

Note that this is completely optional at this point, and the full
scope of the kurtosis definition is still available to whomever
needs/wants it.

Tests

Additional context

Metadata

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 45.85%. Comparing base (2fb8c66) to head (0cc49f4).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop   #13728      +/-   ##
===========================================
- Coverage    47.25%   45.85%   -1.40%     
===========================================
  Files          958      901      -57     
  Lines        80075    75302    -4773     
  Branches       773      773              
===========================================
- Hits         37836    34530    -3306     
+ Misses       39335    38051    -1284     
+ Partials      2904     2721     -183     

Flag	Coverage Δ
cannon-go-tests-32	?
cannon-go-tests-64	?
contracts-bedrock-tests	90.57% <ø> (-0.20%)	⬇️

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see 72 files with indirect coverage changes