Add Target Setting Flags and MachineFeature.getTargetSettingFlags.

[arcanapower]

Some machine features are read only, use target setting flags to check if they are writable.

[Copilot]

Pull request overview

This PR adds support for Target Setting Flags to the FTMS (Fitness Machine Service) library, enabling the determination of which machine features are writable versus read-only. The implementation introduces a new TargetSettingFlag class with 17 flag definitions and a method to extract these flags from the second 32-bit segment of the machine feature data.

• Adds TargetSettingFlag class with 17 target setting flags for various fitness machine parameters
• Implements getTargetSettingFlags() method in MachineFeature to parse target setting flags from bytes 4-7 of the data
• Exports TargetSettingFlag class in the public API

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 4 comments.

File	Description
lib/src/ftms/characteristic/machine/feature/target_setting_flag.dart	Defines 17 target setting flags representing writable machine features (speed, power, resistance, etc.)
lib/src/ftms/characteristic/machine/feature/machine_feature.dart	Adds allTargetSettingFlags getter and getTargetSettingFlags() method to parse flags from the second 4-byte segment
lib/flutter_ftms.dart	Exports TargetSettingFlag class to make it available in the public API

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[Malte2036]

Hey @arcanapower,

can you add a test to machine_feature_test.dart with real ftms data, then i can merge this PR 😁