Add Options for MetricValidator

[kristinapathak]

fixes #87

Did some other stuff too:

• Changed some hardcoded strings for metric values to be consts declared in metrics.go.
• Removed Partner from ParsedValues since no one is using it. I kept the struct, even though it has only one value, to make it easier to add values in a backwards-compatible way in the future.
• Moved some code to new files so metricvalidator.go doesn't get too big (it's still pretty big 👀).
• Updated metricValidator's prepMetrics() function to return a struct instead of a bunch of individual strings.
• Fixed up ProvideMetricValidator() so it actually kind of works.

[codecov]

Codecov Report

Merging #99 (e0ec01b) into main (21f7b47) will increase coverage by 1.03%.
The diff coverage is 91.42%.

❗ Current head e0ec01b differs from pull request most recent head 0e36e95. Consider uploading reports for the commit 0e36e95 to get more accurate results

@@            Coverage Diff             @@
##             main      #99      +/-   ##
==========================================
+ Coverage   67.77%   68.81%   +1.03%     
==========================================
  Files          35       38       +3     
  Lines         962      978      +16     
==========================================
+ Hits          652      673      +21     
+ Misses        291      286       -5     
  Partials       19       19              

Impacted Files	Coverage Δ
basculechecks/errors.go	100.00% <ø> (ø)
basculechecks/metrics.go	0.00% <ø> (ø)
basculechecks/provide.go	0.00% <0.00%> (ø)
basculechecks/metricoptions.go	100.00% <100.00%> (ø)
basculechecks/metricvalidator.go	100.00% <100.00%> (+10.89%)	⬆️
basculechecks/parse.go	100.00% <100.00%> (ø)

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[joe94]

Looks great! 🚀

[sonarcloud]

Kudos, SonarCloud Quality Gate passed!

0 Bugs
0 Vulnerabilities
0 Security Hotspots
0 Code Smells

91.9% Coverage
0.0% Duplication