feat(node): add simulation mode

[zcabter]

Context

Closes JSTZ-1001

This PR is the set up required for JSTZ-1003 and JSTZ-1004

Description

Adds enable_simulation flag to jstz node.

Manually testing the PR

Current tests still run
make

[codecov]

Codecov Report

❌ Patch coverage is 90.90909% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 64.35%. Comparing base (ad83e73) to head (9286b27).

Files with missing lines	Patch %	Lines
crates/jstz_node/src/main.rs	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
crates/jstz_node/src/config.rs	98.07% <100.00%> (+0.02%)	⬆️
crates/jstz_node/src/lib.rs	86.44% <100.00%> (+0.17%)	⬆️
crates/jstzd/src/config.rs	95.37% <100.00%> (+<0.01%)	⬆️
crates/jstzd/src/task/jstzd.rs	45.11% <100.00%> (+0.08%)	⬆️
crates/jstz_node/src/main.rs	0.00% <0.00%> (ø)

... and 1 file with indirect coverage changes

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[ryutamago]

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