Native support for Datadog metrics

[azlam-abdulsalam]

Fixes #494

Support Datadog natively

• Uses environment variables SFPOWERSCRIPTS_DATADOG, SFPOWERSCRIPTS_DATADOG_HOST and SFPOWERSCRIPTS_DATADOG_API_KEY to set up the required API integration
  
• Flush is set to 0, so the metrics are sent immediately, as CI/CD agents could crash and there would be chances, it wont have time to report if using buffered

[codecov-commenter]

Codecov Report

Merging #505 (06a7971) into develop (0db7480) will decrease coverage by 2.57%.
The diff coverage is 54.54%.

@@             Coverage Diff             @@
##           develop     #505      +/-   ##
===========================================
- Coverage    81.17%   78.59%   -2.58%     
===========================================
  Files           33       35       +2     
  Lines         1126     1210      +84     
  Branches       200      212      +12     
===========================================
+ Hits           914      951      +37     
- Misses         212      259      +47     

Impacted Files	Coverage Δ
...werscripts-cli/src/utils/get18DigitSalesforceId.ts	21.42% <21.42%> (ø)
packages/core/src/utils/SFPStatsSender.ts	35.48% <22.72%> (-20.77%)	⬇️
packages/core/src/package/PackageDiffImpl.ts	92.50% <77.77%> (+0.19%)	⬆️
...rscripts-cli/src/impl/release/ReleaseDefinition.ts	92.85% <92.85%> (ø)
...ckages/sfpowerscripts-cli/src/ProjectValidation.ts	69.23% <93.33%> (ø)

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