add preamble_length to settings list

[dinets]

Adding preamble_length in Lora config list, to get ability change this parameter.

For what?

To controlling external Power Amplifier, specially for old half_duplex PA with RF relays

Summary by CodeRabbit

• New Features
  • Added a configurable LoRa preamble length setting.
  • Included documentation for the new configuration option.

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[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: CHILL

Plan: Pro Plus

Run ID: ff2a4897-241e-4dad-b617-030b21a74191

📥 Commits

Reviewing files that changed from the base of the PR and between bfd718f and ea35c96.

📒 Files selected for processing (1)

• meshtastic/config.proto

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📝 Walkthrough

Walkthrough

LoRaConfig gains a documented uint32 preamble_length field with protobuf field number 108, following serial_hal_only.

Changes

LoRa configuration

Layer / File(s)	Summary
Add LoRa preamble length field meshtastic/config.proto	Adds the documented preamble_length field to LoRaConfig with field number 108.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Suggested reviewers: thebentern, jp-bennett

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the main change: adding preamble_length to the LoRa settings list.
Description check	✅ Passed	The description states the change and use case, but it omits the template's issue link and checklist sections.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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