feat: add configuration option for proxy and redirects

[bednar]

Proposed Changes

1. Added documentation for proxies and redirects
2. Added option to configure proxy
3. Added option to configure redirects

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• make test completes successfully
• Commit messages are in semantic format
• Sign CLA (if not already signed)

[codecov-commenter]

Codecov Report

Merging #86 (cac0adc) into master (ba23abe) will increase coverage by 0.03%.
The diff coverage is 100.00%.

@@             Coverage Diff              @@
##             master      #86      +/-   ##
============================================
+ Coverage     82.86%   82.90%   +0.03%     
  Complexity      377      377              
============================================
  Files            23       23              
  Lines           893      895       +2     
============================================
+ Hits            740      742       +2     
  Misses          153      153              

Impacted Files	Coverage Δ
src/InfluxDB2/Client.php	93.54% <ø> (ø)
src/InfluxDB2/DefaultApi.php	83.87% <100.00%> (+0.53%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update ba23abe...cac0adc. Read the comment docs.