feat(jstz): use file wrapper for kernel debug log in config

[huancheng-trili]

Context

Part of JSTZ-250.
JSTZ-250

Description

Use FileWrapper in jstz node config for kernel debug log.

kernel_debug_file does not get deserialised since we don't have any use case for that, so we don't need to implement Deserialize for FileWrapper. Overall, carrying a file like this in config is definitely not good because it complicates de/serialisation. There should be a refactor later on to get rid of all these whatever wrapper in config types and instead hold them somewhere else like in the jstzd state or so.

Manually testing the PR

• Unit test: added one tests. All existing relevant tests should still work since fundamentally there is nothing changed.

[codecov]

Codecov Report

Attention: Patch coverage is 92.59259% with 2 lines in your changes missing coverage. Please review.

Project coverage is 47.80%. Comparing base (bd1b922) to head (91a67af).

Files with missing lines	Patch %	Lines
crates/jstzd/src/task/octez_rollup.rs	83.33%	0 Missing and 2 partials ⚠️

Files with missing lines	Coverage Δ
crates/jstzd/src/config.rs	97.36% <100.00%> (-0.06%)	⬇️
crates/octez/src/async/rollup.rs	89.04% <100.00%> (+0.21%)	⬆️
crates/jstzd/src/task/octez_rollup.rs	79.62% <83.33%> (+0.46%)	⬆️

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