internal/format: added parser for CLDR number patterns

This is only for internal use, e.g. generators, the numbers,
units, currency packages, etc.

Change-Id: I716870c9edcb78a583d176139e88e57eb6dbfd17
Reviewed-on: https://go-review.googlesource.com/17441
Reviewed-by: Hyang-Ah Hana Kim <hyangah@gmail.com>
2 files changed