docs: add New Relic templates

[akorzynski]

closes: #3771

Checklist:

• Either (a) I've created an enhancement proposal and discussed it with the community, (b) this is a bug fix, or (c) this is a chore.
• The title of the PR is (a) conventional with a list of types and scopes found here, (b) states what changed, and (c) suffixes the related issues number. E.g. "fix(controller): Updates such and such. Fixes #1234".
• I've signed my commits with DCO
• I have written unit and/or e2e tests for my change. PRs without these are unlikely to be merged.
• My builds are green. Try syncing with master if they are not.
• My organization is added to USERS.md.

[github-actions]

Published E2E Test Results

  4 files    4 suites   3h 26m 8s ⏱️
112 tests 101 ✅  7 💤 4 ❌
456 runs  420 ✅ 28 💤 8 ❌

For more details on these failures, see this check.

Results for commit be475f2.

♻️ This comment has been updated with latest results.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.98%. Comparing base (c1ffa8e) to head (be475f2).
Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3795      +/-   ##
==========================================
- Coverage   84.00%   83.98%   -0.03%     
==========================================
  Files         162      162              
  Lines       18517    18517              
==========================================
- Hits        15556    15551       -5     
- Misses       2100     2103       +3     
- Partials      861      863       +2     

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[github-actions]

Published Unit Test Results

2 263 tests   2 263 ✅  2m 58s ⏱️
  128 suites      0 💤
    1 files        0 ❌

Results for commit be475f2.

♻️ This comment has been updated with latest results.

[sonarcloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud

[leoluz]

LGTM

need to take a second look

[leoluz]

Thank you for your collaboration!
This doc was mainly targeting how to define AnalysisTemplates using the built in NewRelic metrics provider. You are documenting how to achieve the same using the web provider. We want to keep the simple with the built in provider use case as the main target of this document.
The suggestions are:

• add the big yamls in the examples folder
• explain at the bottom of this document what are the advantages of using the web provider and reference the examples