Add topoproto.IsTabletWithinKeyRanges(...) helper

[timvaillancourt]

Description

To compliment the new/v22 key-range awareness in VTOrc's --clusters_to_watch flag, this PR adds to go/vt/topo/topoproto the helpers:

1. IsTabletWithinKeyRanges(...) bool
2. IsTabletWithinKeyRangesString(...) (bool, error)

This is useful for external automation to validate that a VTOrc using a range-based --clusters_to_watch value will monitor a given *topodatapb.Tablet, mimic'ing the logic of the shouldWatchTablet(...) func of go/vt/vtorc/logic/tablet_discovery.go

The real-world use case of this is automation to "find" the VTOrc of a given tablet and/or validate a tablet is being watched by someone

Related Issue(s)

#17330

Checklist

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[vitess-bot]

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