feat: Add include option to getObject and fetch

[mbfakourii]

New Pull Request Checklist

• I am not disclosing a vulnerability.
• I am creating this PR in reference to an issue.

Issue Description

Added include in getObject and fetch
Added test

Related issue: #797

Approach

In ParseObject class and getObject and fetch functions there is no value include

TODOs before merging

• Add tests
• Add changes to documentation (guides, repository pages, in-code descriptions)
• A changelog entry

[parse-github-assistant]

Thanks for opening this pull request!

• ❌ Please link an issue that describes the reason for this pull request, otherwise your pull request will be closed. Make sure to write it as Closes: #123 in the PR description, so I can recognize it.

[codecov]

Codecov Report

Base: 11.52% // Head: 13.66% // Increases project coverage by +2.13% 🎉

Coverage data is based on head (2977b19) compared to base (2befe18).
Patch coverage: 90.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #798      +/-   ##
==========================================
+ Coverage   11.52%   13.66%   +2.13%     
==========================================
  Files          47       47              
  Lines        2846     2847       +1     
==========================================
+ Hits          328      389      +61     
+ Misses       2518     2458      -60     

Impacted Files	Coverage Δ
packages/dart/lib/parse_server_sdk.dart	28.57% <ø> (ø)
packages/dart/lib/src/network/parse_query.dart	20.73% <ø> (+0.41%)	⬆️
packages/dart/lib/src/utils/parse_utils.dart	46.15% <80.00%> (+4.97%)	⬆️
packages/dart/lib/src/objects/parse_object.dart	15.78% <100.00%> (+5.21%)	⬆️
packages/dart/lib/src/objects/parse_base.dart	44.95% <0.00%> (+2.75%)	⬆️
packages/dart/lib/src/objects/parse_file.dart	4.00% <0.00%> (+4.00%)	⬆️
packages/dart/lib/src/utils/parse_encoder.dart	66.66% <0.00%> (+9.99%)	⬆️
packages/dart/lib/src/data/parse_core_data.dart	67.39% <0.00%> (+10.86%)	⬆️
packages/dart/lib/src/utils/parse_decoder.dart	37.73% <0.00%> (+24.52%)	⬆️
... and 2 more

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[mtrezza]

(Sorry for tagging everyone for review here; but we didn't get any reviews on the last PR, so I hope someone could talk a look at this)

[mtrezza]

Could you bump the version and add the cangelog?

[mbfakourii]

Could you bump the version and add the cangelog?

added