TRIVIAL: extend list of classes exported from SDK init

[jaceksan]

handy when processing declarative documents and want to type arguments of functions properly

[ghost]

Build succeeded (check pipeline).

[codecov-commenter]

Codecov Report

Merging #132 (585af3e) into master (42929f5) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #132   +/-   ##
=======================================
  Coverage   91.75%   91.75%           
=======================================
  Files          71       71           
  Lines        4426     4427    +1     
=======================================
+ Hits         4061     4062    +1     
  Misses        365      365           

Impacted Files	Coverage Δ
gooddata-sdk/gooddata_sdk/__init__.py	100.00% <100.00%> (ø)

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[yenkins]

Sonar scan result

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[ghost]

Build succeeded (gate pipeline).

• https://checklist.intgdc.com/job/compliance/job/gooddata-python-sdk-sonarqube-scan-zuul-gate/119/ : SUCCESS in 55s
• https://checklist.intgdc.com/job/compliance/job/gooddata-python-sdk-fossa-scanning-zuul-el7/119/ : FAILURE in 13s (non-voting)
• https://checklist.intgdc.com/job/compliance/job/gooddata-python-sdk-merge-compliance-check/121/ : SUCCESS in 20s