feat: Add new Properties field to ProvisionWatcher DTO and Model

[judehung]

Add an extendable field into ProvisionWatcher DTO and Model: Properties map[string]any. This is useful when certain device services requires extra information from ProvisionWatcher. For example, assume a device service would like to generate the device name in certain format during auto discovery, the user can define a property "DeviceNameTemplate" with value as the template of device name in the ProvisionWatcher, so that the device service can pick up such property to generate the device name.

fixes #772

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• 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?)
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[codecov-commenter]

Codecov Report

Merging #803 (4695302) into main (1bb5704) will decrease coverage by 0.08%.
The diff coverage is 20.00%.

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@@            Coverage Diff             @@
##             main     #803      +/-   ##
==========================================
- Coverage   64.46%   64.39%   -0.08%     
==========================================
  Files          80       80              
  Lines        3079     3084       +5     
==========================================
+ Hits         1985     1986       +1     
- Misses        905      908       +3     
- Partials      189      190       +1     

Impacted Files	Coverage Δ
dtos/requests/provisionwatcher.go	71.42% <0.00%> (-2.65%)	⬇️
dtos/provisionwatcher.go	35.00% <33.33%> (-0.14%)	⬇️

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[cloudxxx8]

LGTM