feat: return `HTTPResponse` from certain methods

[bmario]

These methods are Document.save(), Document.delete(), and Document.copy().

Breaking change: Document.copy() does not return a Document anymore. You can use the ETag and fetch the document yourself. Rationale: For efficiency, retrieving the copied document automatically is a bad idea anyways, so returning the response instead does not seem to be an issue. If you need the document, use the ETag, which is a part of the response object, to retrieve it.

Closes #49

[codecov[bot]]

Codecov Report

Merging #53 (fe87e8b) into master (5a42ab9) will increase coverage by 0.04%. Report is 9 commits behind head on master. The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #53      +/-   ##
==========================================
+ Coverage   97.15%   97.19%   +0.04%     
==========================================
  Files          13       13              
  Lines         950      964      +14     
==========================================
+ Hits          923      937      +14     
  Misses         27       27              

Files Changed	Coverage Δ
aiocouch/__init__.py	100.00% <100.00%> (ø)
aiocouch/document.py	91.01% <100.00%> (+0.20%)	:arrow_up:
aiocouch/remote.py	96.89% <100.00%> (+0.08%)	:arrow_up:

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[adrienverge]

Thanks a lot @bmario for tackling this. We briefly tested this pull request on Document.save() and we could access the HTTP code (201 vs. 202) from Python code, as asked in https://github.com/metricq/aiocouch/issues/49. Thanks again!