feat(alerts): add support for nrql condition signal seasonality

[akane0915]

https://new-relic.atlassian.net/browse/NR-368786
Adds support for Alerts NRQL condition signal seasonality for baseline conditions.

Related TF provider PR: newrelic/terraform-provider-newrelic#2844

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 35.17%. Comparing base (4dabf76) to head (777fb0c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1280   +/-   ##
=======================================
  Coverage   35.17%   35.17%           
=======================================
  Files         127      127           
  Lines        7659     7659           
=======================================
  Hits         2694     2694           
  Misses       4784     4784           
  Partials      181      181           

Flag	Coverage Δ
unit	35.17% <ø> (ø)

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