Implement batchLimit on PersistentHitQueue

[addb]

Description

Added batchLimit to the PersistentHitQueue so the hits would be processed only after the queue size reaches batchLimit.

Related Issue

Motivation and Context

Batching is required for Analytics hits.

How Has This Been Tested?

Have added Unit tests.

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• I have signed the Adobe Open Source CLA.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.

[codecov]

Codecov Report

Merging #496 (c17a9bb) into dev (f78bf6b) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##              dev     #496      +/-   ##
==========================================
+ Coverage   87.70%   87.74%   +0.04%     
==========================================
  Files          92       92              
  Lines        4113     4128      +15     
==========================================
+ Hits         3607     3622      +15     
  Misses        506      506