Improve SNTP options

[networkfusion]

Description

Improves default startup delay of SNTP for ChibiOS targets.

Motivation and Context

By default the delay was 30 seconds.
Given that return NetworkHelper.SetupAndConnectNetwork(requiresDateTime: true, token: token);
Where all samples (and appropriate timeout) would be CancellationTokenSource cs = new(10000); // ten seconds
It generally fails as the SNTP helper was not yet started yet.
It passes on a restart of the target because enough time has generally elapsed by the time the user has noticed and re-plugged the USB.

Although there are a number of improvements could be made, this fixes the most specific issue and also makes aware and fixes similar related to TI targets.

How Has This Been Tested?

Screenshots

Types of changes

• Improvement (non-breaking change that improves a feature, code or algorithm)
• Bug fix (non-breaking change which fixes an issue with code or algorithm)
• New feature (non-breaking change which adds functionality to code)
• Breaking change (fix or feature that would cause existing functionality to change)
• Config and build (change in the configuration and build system, has no impact on code or features)
• Dev Containers (changes related with Dev Containers, has no impact on code or features)
• Dependencies (update dependencies and changes associated, has no impact on code or features)
• Documentation (changes or updates in the documentation, has no impact on code or features)

Checklist

• My code follows the code style of this project (only if there are changes in source code).
• My changes require an update to the documentation (there are changes that require the docs website to be updated).
• I have updated the documentation accordingly (the changes require an update on the docs in this repo).
• I have read the CONTRIBUTING document.
• I have tested everything locally and all new and existing tests passed (only if there are changes in source code).

[josesimoes]

LGTM! Thanks for looking into this.