feat: adding length method to attribute list and updating http.url attribute in net/http instrumentation

[varkey98]

Description

1. adding a length method to attribute list
2. Updating the http.url attribute in net/http instrumentation in case if its not the complete url

Checklist:

• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• Any dependent changes have been merged and published in downstream modules

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (08b9173) 58.77% compared to head (074687b) 58.32%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #224      +/-   ##
==========================================
- Coverage   58.77%   58.32%   -0.45%     
==========================================
  Files          55       55              
  Lines        2205     2210       +5     
==========================================
- Hits         1296     1289       -7     
- Misses        850      861      +11     
- Partials       59       60       +1     

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[varkey98]

fixing this issue in the instrumentation itself: https://github.com/Traceableai/goagent-src/blob/2320366e224b742d023236680e7b460e4a17630f/filter/traceable/filter.go#L352