feat: implement secret change support, refactor cred mgmt

[ajcasagrande]

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PR Checklist

Please check if your PR fulfills the following requirements:

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

Codecov Report

Merging #333 (368d8b8) into main (ca50ff0) will increase coverage by 0.56%. The diff coverage is 17.26%.

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@@            Coverage Diff             @@
##             main     #333      +/-   ##
==========================================
+ Coverage   33.38%   33.95%   +0.56%     
==========================================
  Files          18       18              
  Lines        1800     1832      +32     
==========================================
+ Hits          601      622      +21     
- Misses       1133     1143      +10     
- Partials       66       67       +1     

Impacted Files	Coverage Δ
internal/driver/basenotificationresthandler.go	0.00% <0.00%> (ø)
internal/driver/checkstatuses.go	37.61% <0.00%> (-2.20%)	:arrow_down:
internal/driver/onvifclient.go	19.66% <0.00%> (-3.99%)	:arrow_down:
internal/driver/onvifdiscovery.go	27.60% <0.00%> (-0.51%)	:arrow_down:
internal/driver/pullpointsubscriber.go	0.00% <0.00%> (ø)
internal/driver/driver.go	19.42% <29.72%> (+5.32%)	:arrow_up:
internal/driver/credentials.go	75.75% <50.00%> (-24.25%)	:arrow_down:
internal/driver/macmapper.go	86.56% <50.00%> (-2.50%)	:arrow_down: