Don't use transactions by default for internal SDK calls

[cbaker6]

Using transactions with the latest release of parse-server using mongoDB produces errors while saving. Because of this, transactions are disabled by default. If the developer wants to use transactions internally (was used for saveAll children) in the SDK, they should set useTransactionsInternally=true when configuring the client.

Mongo users should update to Swift SDK 1.8.1 as versions 1.2.1 - 1.8.0 use transactions by default.

Note: transactions work fine with postgres.

• Disable automatic use of transactions internally
• Add useTransactionsInternally to ParseConfiguration
• Update playgrounds
• Add changelog
• Prepare for release

Close #157

[codecov]

Codecov Report

Merging #158 (850340b) into main (685f07a) will increase coverage by 0.16%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #158      +/-   ##
==========================================
+ Coverage   81.98%   82.14%   +0.16%     
==========================================
  Files          70       70              
  Lines        6555     6582      +27     
==========================================
+ Hits         5374     5407      +33     
+ Misses       1181     1175       -6     

Impacted Files	Coverage Δ
Sources/ParseSwift/LiveQuery/Messages.swift	100.00% <ø> (ø)
Sources/ParseSwift/Objects/ParseObject.swift	77.54% <ø> (+0.26%)	⬆️
Sources/ParseSwift/Parse.swift	100.00% <100.00%> (ø)
Sources/ParseSwift/Types/Query.swift	93.35% <100.00%> (+1.04%)	⬆️
Sources/ParseSwift/Objects/ParseUser.swift	81.67% <0.00%> (+0.15%)	⬆️

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[cbaker6]

@davimacedo @dplewis is this why parse-community/Parse-SDK-JS#1090 isn't merged?

[parse-github-assistant]

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