PanelEdit: Add Decimal value formatter to disable and decimal rounding #53577
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What this PR does / why we need it:
Adds a new unit value formatter "Decimal" (that is just the the String value formatter) to create a (hopefully) more obvious way to disable decimal values from being rounded.
We don't want to change the default behaviour of the number formatter because we optimise for most queries people make - Prometheus producing values with many decimal points.
Which issue(s) this PR fixes:
Fixes #49388
Special notes for your reviewer:
I'm not sure if just aliasing the string formatter is the best approach, but it's essentially what @kaydelaney did in her earlier PR. thoughts @torkelo @kaydelaney ?