DistanceUnitMapping is not consistent with the gateway spec

[mvanschellebeeck]

Problem

Gateway defines a DistanceUnit as one of:

        - MILLIMETERS
        - CENTIMETERS
        - METERS
        - KILOMETERS
        - INCHES
        - FEET
        - YARDS
        - MILES
        - NAUTICAL_MILES

but osdk-ts allows lowercase and plural equivalents through a mapping here:

osdk-ts/packages/api/src/aggregate/WhereClause.ts

Lines 55 to 76 in d815339

	export const DistanceUnitMapping: {
	centimeter: "CENTIMETERS";
	centimeters: "CENTIMETERS";
	cm: "CENTIMETERS";
	meter: "METERS";
	meters: "METERS";
	m: "METERS";
	kilometer: "KILOMETERS";
	kilometers: "KILOMETERS";
	km: "KILOMETERS";
	inch: "INCHES";
	inches: "INCHES";
	foot: "FEET";
	feet: "FEET";
	yard: "YARDS";
	yards: "YARDS";
	mile: "MILES";
	miles: "MILES";
	nautical_mile: "NAUTICAL_MILES";
	nauticalMile: "NAUTICAL_MILES";
	"nautical miles": "NAUTICAL_MILES";
	} = {

Desired state

osdk-ts should restrict units to the options in the spec and not offer a mapping to keep the SDKs consistent