Add MigrationBuilder::insertBatch() method, deprecate batchInsert()

[vjik]

Q	A
Is bugfix?	❌
New feature?	❌
Breaks BC?	❌
Fix #332

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 12.85%. Comparing base (38fdc07) to head (0ce05e4).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/MigrationBuilder.php	0.00%	4 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #334      +/-   ##
============================================
- Coverage     12.91%   12.85%   -0.06%     
- Complexity      293      294       +1     
============================================
  Files            20       20              
  Lines           945      949       +4     
============================================
  Hits            122      122              
- Misses          823      827       +4     

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