Simplify CommandProvider::class.

[terabytesoftw]

Q	A
Is bugfix?	✔️
New feature?	❌
Breaks BC?	❌

[what-the-diff]

• Removed the BaseCommandProvider class and extended AbstractCommandProvider.
• Added parent::batchInsert() to batchInsert method instead of calling it from BaseCommandProvider instance.
• Deleted rawSql, update and upsert methods as they are already implemented in AbstractCommandProvider class now (and we don't need them anymore).

[codecov]

Codecov Report

Base: 94.93% // Head: 94.93% // No change to project coverage 👍

Coverage data is based on head (56bb9ec) compared to base (561b9a9).
Patch has no changes to coverable lines.

❗ Current head 56bb9ec differs from pull request most recent head 8a40851. Consider uploading reports for the commit 8a40851 to get more accurate results

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #150   +/-   ##
=========================================
  Coverage     94.93%   94.93%           
  Complexity      326      326           
=========================================
  Files            16       16           
  Lines           809      809           
=========================================
  Hits            768      768           
  Misses           41       41           

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