feat(session): add some .key() .items() methods

[trim21]

No description provided.

[codecov]

Codecov Report

Merging #111 (9af6f7a) into master (28f28bd) will increase coverage by 2.33%.
The diff coverage is 85.22%.

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
+ Coverage   71.24%   73.58%   +2.33%     
==========================================
  Files          13       14       +1     
  Lines        1238     1287      +49     
==========================================
+ Hits          882      947      +65     
+ Misses        356      340      -16     

Flag	Coverage Δ
3.6	73.29% <84.09%> (+2.28%)	⬆️
3.7	73.29% <84.09%> (+2.28%)	⬆️
3.8	73.48% <84.09%> (+2.26%)	⬆️
3.9	73.56% <85.22%> (+2.34%)	⬆️
pypy3	73.29% <84.09%> (+2.28%)	⬆️

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Impacted Files	Coverage Δ
transmission_rpc/session.py	73.95% <78.68%> (+30.12%)	⬆️
tests/test_session.py	100.00% <100.00%> (ø)
transmission_rpc/client.py	64.05% <100.00%> (ø)

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