Jstzd: spawn node in jstzd server

[ryutamago]

Context

task

The ci fails for the same reason as the rollup PR

Description

• spawn jstz-node in jstzd
• introduce a type aliass Shared and refactored the jstzd by adding a blanket implementation so we can avoid having to write Arc<RwLock<.. everywhere

Manually testing the PR

add integration tests the runs successfully locally

nix flake check

[codecov]

Codecov Report

Attention: Patch coverage is 80.55556% with 7 lines in your changes missing coverage. Please review.

Project coverage is 48.04%. Comparing base (a013349) to head (cfceb97).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/jstzd/src/task/jstzd.rs	75.00%	1 Missing and 6 partials ⚠️

Files with missing lines	Coverage Δ
crates/jstzd/src/config.rs	96.85% <100.00%> (+0.06%)	⬆️
crates/jstzd/src/task/child_wrapper.rs	93.33% <ø> (ø)
crates/jstzd/src/task/jstzd.rs	77.48% <75.00%> (+1.42%)	⬆️

... and 1 file with indirect coverage changes

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[huancheng-trili]

Looks fine, but please keep code refactoring in separate PRs and do not refactor while the part of the code base involved is being actively worked on.