Add itrs to AllowedUvwFrames

[sjperkins]

This PR adds itrs to AllowedUvwFrames as it would allow a topocentric frame for new MSv4 datasets, rather than from a perspective of supporting legacy MSv2 datasets.

• ITRS in AllowedUvwFrames #476 (comment)

It might make sense to support other frames from SkyCoordFrames, but this needs further investigation

xradio/src/xradio/measurement_set/schema.py

Lines 262 to 292 in 1595f0b

	# Taken from the list of astropy built-in frame classes: https://docs.astropy.org/en/stable/coordinates/index.html
	AllowedSkyCoordFrames = Literal[
	"icrs",
	"fk5",
	"fk4",
	"fk4noterms",
	"galactic",
	"galactocentric",
	"supergalactic",
	"altaz",
	"hadec",
	"gcrs",
	"cirs",
	"itrs",
	"hcrs",
	"teme",
	"tete",
	"precessedgeocentric",
	"geocentricmeanecliptic",
	"barycentricmeanecliptic",
	"heliocentricmeanecliptic",
	"geocentrictrueecliptic",
	"barycentrictrueecliptic",
	"heliocentrictrueecliptic",
	"heliocentriceclipticiau76",
	"custombarycentricecliptic",
	"lsr",
	"lsrk",
	"lsrd",
	"galacticlsr",
	]

[codecov]

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