feat(cel-shed): Add blob.Submit and blob.Retrieve latency monitor tool

[renaynay]

Adds blob.Submit and blob.Retrieve latency monitor tool via latency-monitor

./cel-shed latency-monitor <node ip> <node port> <auth token> <metrics endpoint> 

• works with either LN or BN
• creates rpc client + submits + retrieves blobs
• blob is currently 7000 bytes but will make that configurable later

[codecov-commenter]

Codecov Report

:x: Patch coverage is 4.76190% with 140 lines in your changes missing coverage. Please review. :white_check_mark: Project coverage is 36.10%. Comparing base (2469e7a) to head (eb6c2fe). :warning: Report is 630 commits behind head on main.

Files with missing lines	Patch %	Lines
cmd/cel-shed/latency_monitor.go	0.00%	116 Missing :warning:
libs/utils/telemetry.go	0.00%	22 Missing :warning:
cmd/cel-shed/main.go	0.00%	1 Missing :warning:
cmd/flags_misc.go	0.00%	1 Missing :warning:

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4718      +/-   ##
==========================================
- Coverage   44.83%   36.10%   -8.74%     
==========================================
  Files         265      308      +43     
  Lines       14620    20840    +6220     
==========================================
+ Hits         6555     7524     +969     
- Misses       7313    12352    +5039     
- Partials      752      964     +212     

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

:rocket: New features to boost your workflow:

• :snowflake: Test Analytics: Detect flaky tests, report on failures, and find test suite problems.