feat: [sc-478107] Allow explicitly specifying gas limit

[rpatel-figure]

Context

The default fee estimating logic sometimes fails when dealing with relatively larger specification updates. We can allow consumers to override the calculated gas limit.

Changes

• Allow gas limit to be hardcoded to override what the message fee client would otherwise calculate
• Clean up a few code smells

---

Note

Medium Risk
Touches transaction fee/gas estimation and broadcasting behavior; an incorrect fixed limit could cause tx failures or unintended fees when publishing specs.

Overview
Adds a new fixedGasLimit configuration on P8eLocationExtension, documented in the README, to allow consumers to override the gas limit used for tx fee estimation.

Updates ProvenanceClient to use a custom gas estimator that still queries the msg-fee service for fees but applies the configured fixed limit when set; includes a small Kotlin destructuring cleanup in Bootstrapper.

^{Written by Cursor Bugbot for commit 2427cc9. This will update automatically on new commits. Configure here.}

[orca-security-us]

Orca Security Scan Summary

Status	Check	Issues by priority
Passed	Secrets	0   0   0   0	View in Orca

[github-actions]

Test Results

1 files  ±0  1 suites  ±0   4s ⏱️ ±0s
5 tests ±0  5 ✅ ±0  0 💤 ±0  0 ❌ ±0 
9 runs  ±0  9 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 2427cc9. ± Comparison against base commit 6c3b96f.