Remove sleep from integration test

[withinboredom]

Description

Add support for the metadata endpoint and shutdown.

Issue reference

We strive to have all PR being opened based on an issue, where the problem or feature have been discussed prior to
implementation.

Please reference the issue this PR: #36

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• Tests pass
• Created/updated tests
• Extended the documentation

[codecov-commenter]

Codecov Report

Merging #102 (44edb43) into main (5e2e0b4) will increase coverage by 9.48%.
The diff coverage is 46.66%.

@@             Coverage Diff              @@
##               main     #102      +/-   ##
============================================
+ Coverage     68.71%   78.20%   +9.48%     
- Complexity      494      499       +5     
============================================
  Files            63       63              
  Lines          1819     1606     -213     
============================================
+ Hits           1250     1256       +6     
+ Misses          569      350     -219     

Impacted Files	Coverage Δ
src/lib/Client/DaprClient.php	53.84% <ø> (ø)
src/lib/Client/DaprHttpClient.php	58.33% <33.33%> (-26.29%)	⬇️
src/lib/Client/MetadataResponse.php	100.00% <100.00%> (ø)

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