feat: maintain a harvestCount for use later with harvestId

[metal-messiah]

Add a counter which increments after every harvest. This will be used in a future effort to curate a unique harvest ID for API paging purposes.

Overview

This PR adds a harvestCount int to the runtime object, which increments every time _send is completed. _send is used under the hood by all harvest methods to send data. The plan for the future will be to concat this harvestCount with the ptid and session values to create a unique harvest identifier on blob-consumer payloads.

Related Issue(s)

https://new-relic.atlassian.net/browse/NR-238623
https://new-relic.atlassian.net/browse/NR-238628

Testing

A new, simple jest test has been added to confirm this behavior. WDIO test should be added later when implemented in outgoing harvests

[github-actions]

Asset Size Report

Merging this pull request will result in the following asset size changes:

Agent	Asset	Previous Size	New Size	Diff
lite	loader	32.46 kB / 11.31 kB (gzip)	32.48 kB / 11.32 kB (gzip)	0.05% / 0.06% (gzip)
lite	async-chunk	46.45 kB / 15.27 kB (gzip)	46.51 kB / 15.29 kB (gzip)	0.13% / 0.08% (gzip)
pro	loader	51.63 kB / 17.54 kB (gzip)	51.64 kB / 17.54 kB (gzip)	0.03% / 0.02% (gzip)
pro	async-chunk	87.67 kB / 26.96 kB (gzip)	87.73 kB / 26.97 kB (gzip)	0.07% / 0.04% (gzip)
spa	loader	60.2 kB / 20.16 kB (gzip)	60.21 kB / 20.17 kB (gzip)	0.02% / 0.05% (gzip)
spa	async-chunk	101.79 kB / 31.1 kB (gzip)	101.85 kB / 31.11 kB (gzip)	0.06% / 0.05% (gzip)
lite-polyfills	loader	128.8 kB / 41.08 kB (gzip)	128.82 kB / 41.1 kB (gzip)	0.01% / 0.03% (gzip)
lite-polyfills	async-chunk	58.81 kB / 17.4 kB (gzip)	58.87 kB / 17.41 kB (gzip)	0.1% / 0.06% (gzip)
pro-polyfills	loader	148.83 kB / 47.04 kB (gzip)	148.85 kB / 47.04 kB (gzip)	0.01% / 0.01% (gzip)
pro-polyfills	async-chunk	121.11 kB / 31.83 kB (gzip)	121.17 kB / 31.84 kB (gzip)	0.05% / 0.05% (gzip)
spa-polyfills	loader	156.85 kB / 49.14 kB (gzip)	156.87 kB / 49.15 kB (gzip)	0.01% / 0.02% (gzip)
spa-polyfills	async-chunk	136.46 kB / 36.5 kB (gzip)	136.52 kB / 36.51 kB (gzip)	0.04% / 0.04% (gzip)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.42%. Comparing base (4081c03) to head (25bafe6).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #922   +/-   ##
=======================================
  Coverage   80.42%   80.42%           
=======================================
  Files         154      154           
  Lines        7044     7046    +2     
  Branches     1386     1386           
=======================================
+ Hits         5665     5667    +2     
  Misses       1163     1163           
  Partials      216      216           

Flag	Coverage Δ
unit-tests	58.40% <100.00%> (+0.01%)	⬆️

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