feat:add qps and burst argument

[alswl]

When using agent as benchmark tool for gitops-engine library, we must set the QPS and burst for client-go.

This PR allows the user to set up these two arguements.

[sonarqubecloud[bot]]

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0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

No Coverage information
0.0% Duplication

[alswl]

@zachaller

Hi, could you review this simple pull request?

[codecov[bot]]

Codecov Report

Base: 55.46% // Head: 55.46% // No change to project coverage :thumbsup:

Coverage data is based on head (195338c) compared to base (98ccd3d). Patch coverage: 0.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #478   +/-   ##
=======================================
  Coverage   55.46%   55.46%           
=======================================
  Files          41       41           
  Lines        4504     4504           
=======================================
  Hits         2498     2498           
  Misses       1813     1813           
  Partials      193      193           

Impacted Files	Coverage Δ
pkg/cache/cluster.go	54.86% <0.00%> (ø)

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[alswl]

Friendly ping with @alexmt .