Allow setting polling interval for httpClient

[phanidevavarapu]

Resolves #176

[tigrannajaryan]

StartSettings contains settings that are all applicable both to httpClient and to wsClient. This new setting will be only applicable to httpClient and it will be confusing.

An alternate approach is to make this a method on httpClient, e.g.:

func (h *httpClient) SetPollingInterval(duration time.Duration)

This can be called anytime to set the next polling interval.

[codecov]

Codecov Report

Patch coverage: 86.20% and project coverage change: +0.38 🎉

Comparison is base (efddaa2) 76.11% compared to head (3f4cd0f) 76.49%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #183      +/-   ##
==========================================
+ Coverage   76.11%   76.49%   +0.38%     
==========================================
  Files          24       24              
  Lines        1834     1868      +34     
==========================================
+ Hits         1396     1429      +33     
- Misses        326      327       +1     
  Partials      112      112              

Impacted Files	Coverage Δ
client/internal/receivedprocessor.go	84.28% <ø> (ø)
client/internal/wsreceiver.go	91.42% <ø> (ø)
client/types/callbacks.go	66.66% <ø> (ø)
server/httpconnection.go	33.33% <0.00%> (ø)
client/internal/clientcommon.go	79.80% <81.81%> (ø)
client/internal/mockserver.go	82.35% <85.71%> (+0.31%)	⬆️
server/serverimpl.go	58.92% <94.73%> (+0.37%)	⬆️
client/httpclient.go	95.16% <100.00%> (+0.42%)	⬆️
client/internal/httpsender.go	72.22% <100.00%> (+1.25%)	⬆️
client/wsclient.go	86.58% <100.00%> (+1.82%)	⬆️
... and 2 more

☔ View full report in Codecov by Sentry.
📢 Do you have feedback about the report comment? Let us know in this issue.

[tigrannajaryan]

Thank you @phanidevavarapu