feat(VNumberInput): support append/prepend inner slots/icons #20651

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Job	Run time
pre_job	5s
Build vuetify	1m 47s
Test (Unit)	47s
Test (e2e)	1m 47s
Lint (--scope vuetify --scope @vuetify/api-generator)	1m 2s
Lint (--scope vuetifyjs.com)	4m 15s
Build docs	0s
publish-docs	0s
deploy	0s
	9m 43s

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