Dispose raw response streams after writing

[jpdillingham]

When sending a raw response, the response is returned from a delegate and then sent by the library, making it impossible for the caller to dispose the stream at the correct time.

This PR adds logic to dispose the stream included in raw search and browse responses after the response has been sent over the network.

[sonarcloud[bot]]

SonarCloud Quality Gate failed.   

0 Bugs
0 Vulnerabilities
0 Security Hotspots
18 Code Smells

0.0% Coverage
0.0% Duplication

[codecov[bot]]

Codecov Report

Merging #755 (2bf09d5) into master (a7bb05a) will decrease coverage by 0.19%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##           master     #755      +/-   ##
==========================================
- Coverage   99.22%   99.02%   -0.20%     
==========================================
  Files         178      178              
  Lines        6171     6183      +12     
  Branches      930      933       +3     
==========================================
  Hits         6123     6123              
- Misses         32       44      +12     
  Partials       16       16              

Impacted Files	Coverage Δ
src/BrowseResponse.cs	52.38% <ø> (ø)
src/Messaging/Handlers/PeerMessageHandler.cs	92.57% <0.00%> (-4.44%)	:arrow_down:
src/SearchResponder.cs	91.46% <0.00%> (-4.70%)	:arrow_down:
src/SearchResponse.cs	78.72% <ø> (ø)

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