[poc] new low-level API client

[Art4]

This PR is a proof of concept for a new simplified HTTP client described in #341 as a replacement for the Redmine\Client\Client interface. The new method Redmine\Http\HttpClient::request(string $method, string $path, string $body = ''): Redmine\Http\Response will replace these method calls :

• Redmine\Client\Client::requestGet(string $path): bool;
• Redmine\Client\Client::requestPost(string $path, string $body): bool;
• Redmine\Client\Client::requestPut(string $path, string $body): bool;
• Redmine\Client\Client::requestDelete(string $path): bool;
• Redmine\Client\Client::getLastResponseStatusCode(): int;
• Redmine\Client\Client::getLastResponseContentType(): string;
• Redmine\Client\Client::getLastResponseBody(): string;

All classes extending the Redmine\Api\AbstractApi class also do not require theses methods anymore:

• Redmine\Client\Client::getApi(string $name): Api

This all have been done in a BC way. The next step will be to create a real Redmine\Http\HttpClient implementation and deprecate the Redmine\Client\Client interface and the Redmine\Client\NativeCurlClient and Redmine\Client\Psr18Client classes.

[codecov]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (6efb402) 96.57% compared to head (4312039) 96.71%.

❗ Current head 4312039 differs from pull request most recent head 63dfce8. Consider uploading reports for the commit 63dfce8 to get more accurate results

Files	Patch %	Lines
src/Redmine/Api/AbstractApi.php	98.63%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               v2.x     #357      +/-   ##
============================================
+ Coverage     96.57%   96.71%   +0.13%     
- Complexity      492      534      +42     
============================================
  Files            27       27              
  Lines          1373     1459      +86     
============================================
+ Hits           1326     1411      +85     
- Misses           47       48       +1     

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[kbsali]

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