fix: device timings allow small values and configure TCP connection recovery

[sansmoraxz]

Improve connection parsing with parsing for floating point values and duration strings. The time duration fields can support integer, float and string values.

Also added fields for automated connection recovery (at least for TCP) with sensible defaults (to not break existing configs)

Fixes: #684
Fixes: #374

PR Checklist

Please check if your PR fulfills the following requirements:

• I am not introducing a breaking change (if you are, flag in conventional commit message with BREAKING CHANGE: describing the break)
• I am not introducing a new dependency (add notes below if you are)
• I have added unit tests for the new feature or bug fix (if not, why?)
• I have fully tested (add details below) this the new feature or bug fix (if not, why?)
• I have opened a PR for the related docs change (if not, why?) NA

Testing Instructions

Added test cases. Also test against real device.

New Dependency Instructions (If applicable)

NA

[codecov-commenter]

Codecov Report

❌ Patch coverage is 74.00000% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 42.51%. Comparing base (2c8c7f3) to head (466598e).
⚠️ Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
internal/driver/modbusclient.go	0.00%	9 Missing ⚠️
internal/driver/config.go	90.24%	2 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #688      +/-   ##
==========================================
+ Coverage   40.55%   42.51%   +1.95%     
==========================================
  Files           7        7              
  Lines         715      748      +33     
==========================================
+ Hits          290      318      +28     
- Misses        377      381       +4     
- Partials       48       49       +1     

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[sansmoraxz]

@cloudxxx8 thoughts?