feat: create Client from connection string or environment variables

[alespour]

Closes #

Proposed Changes

This PR adds support to create Client from

• connection string eg. https://us-east-1-1.aws.cloud2.influxdata.com?token=my-token&database=my-database
  Supported parameters:
  • token
  • org
  • database
  • precision
  • gzipThreshold
• environment variables - same names/style as Influx CLI
  • INFLUX_HOST
  • INFLUX_TOKEN
  • INFLUX_ORG
  • INFLUX_DATABASE
  • INFLUX_PRECISION
  • INFLUX_GZIP_THRESHOLD

Checklist

• CHANGELOG.md updated
• Rebased/mergeable
• A test has been added if appropriate
• Tests pass
• Commit messages are conventional

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (b26e715) 98.84% compared to head (66100b7) 98.90%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #46      +/-   ##
==========================================
+ Coverage   98.84%   98.90%   +0.05%     
==========================================
  Files          12       12              
  Lines         955     1007      +52     
==========================================
+ Hits          944      996      +52     
  Misses         11       11              

Files	Coverage Δ
Client/Config/ClientConfig.cs	100.00% <100.00%> (ø)
Client/Config/WriteOptions.cs	100.00% <100.00%> (ø)
Client/InfluxDBClient.cs	94.76% <100.00%> (+0.15%)	⬆️

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