refactor: use generic PSR-18 as an HTTP client

[bednar]

Closes #120
Closes #130

Proposed Changes

Uses https://www.php-fig.org/psr/psr-18/ as a HTTP client instead strong depends to Guzzle:

This PR drops strong couple to Guzzle HTTP client.
Now the user is able to use any implementation of PSR-18 compliant HTTP client - https://packagist.org/providers/psr/http-client-implementation.

The client has to be installed together with HTTP client:

composer require influxdata/influxdb-client-php guzzlehttp/guzzle

Update InfluxDB API to latest version:

This PR also uses a new version of InfluxDB OSS API definitions - oss.yml. The following breaking changes are in underlying API services and doesn't affect common apis such as - WriteApi, QueryApi, HealthApi, ...

• Add ConfigService to retrieve InfluxDB's runtime configuration
• Add DebugService to retrieve debug and performance data from runtime
• Add MetricsService to deal with exposed prometheus metrics
• Add RemoteConnectionsService to deal with registered remote InfluxDB connections
• Add ResourcesService to manage InfluxDB resources
• Add ReplicationService to manage InfluxDB replications
• Add ReplicationService to manage InfluxDB replications
• Update TemplatesService to deal with Stack and Template API
• Update RestoreService to deal with new restore functions of InfluxDB

Breaking Changes

• Remove asynchronous operation based on GuzzleHttp\Message\FutureResponse
• Remove DocumentService in favour of InfluxDB Community Templates. For more info see - influxdb#19300, openapi#192
• Remove DefaultSerive:
  • PostSignin operation is moved to SigninService
  • PostSignout operation is moved to SignoutService

Checklist

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

[codecov-commenter]

Codecov Report

Merging #129 (d7b2e85) into master (66dccec) will decrease coverage by 6.25%.
The diff coverage is 95.12%.

@@             Coverage Diff              @@
##             master     #129      +/-   ##
============================================
- Coverage     80.92%   74.67%   -6.26%     
- Complexity      412      421       +9     
============================================
  Files            24       25       +1     
  Lines          1012     1082      +70     
============================================
- Hits            819      808      -11     
- Misses          193      274      +81     

Impacted Files	Coverage Δ
src/InfluxDB2/ApiException.php	64.28% <ø> (-21.43%)	⬇️
src/InfluxDB2/HeaderSelector.php	73.91% <ø> (ø)
src/InfluxDB2/Client.php	93.75% <66.66%> (-1.25%)	⬇️
src/InfluxDB2/DefaultApi.php	90.47% <94.23%> (-2.55%)	⬇️
src/InfluxDB2/Internal/DebugHttpPlugin.php	100.00% <100.00%> (ø)
src/InfluxDB2/Configuration.php	0.00% <0.00%> (-29.49%)	⬇️

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