Move icu_num_utils to utils/num

[zbraniecki]

Fixes #167.

This just moves the icu_num_utils component to be utils/num and renames it to icu_utils_num.

I'm open to discuss whether the latter is necessary. My motivation is that it allows us to collect all utils as icu_utils and num_utils is just one of them.

[zbraniecki]

An open question is whether we want to have utils/fixed_decimal and icu-utils-fixed-decimal (or just fixed-decimal)? I'm not sure how many utils for numbers will we have and is utils/num and icu-utils-num just an alias for fixed-decimal or for a collection of APIs that fixed-decimal is just one of.

[coveralls]

Pull Request Test Coverage Report for Build a3d04779625fdf536de0dcd2d6cd16363142e69c-PR-303

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• 71 unchanged lines in 15 files lost coverage.
• Overall coverage decreased (-6.03%) to 77.652%

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Files with Coverage Reduction	New Missed Lines	%
components/data-provider/src/data_entry.rs	1	86.27%
components/locale/src/parser/errors.rs	1	62.5%
components/locale/src/subtags/variants.rs	1	85.71%
components/data-provider/src/structs/decimal.rs	2	23.53%
components/data-provider/src/structs/plurals.rs	2	75.0%
components/locale/src/extensions/transform/fields.rs	2	89.47%
components/locale/src/extensions/unicode/attributes.rs	2	85.71%
components/locale/src/extensions/unicode/key.rs	2	91.3%
components/locale/src/extensions/unicode/keywords.rs	2	84.62%
components/locale/src/extensions/unicode/value.rs	2	92.68%

Totals
Change from base Build b100859a1e2ff1b89193c2cdbb484c199c56b591:	-6.03%
Covered Lines:	2891
Relevant Lines:	3723

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💛 - Coveralls

[jira-pull-request-webhook]

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[sffc]

+1 for utils/fixed_decimal.

The package name should be either "icu-fixed-decimal" or "fixed-decimal", whichever makes you happier.

[zbraniecki]

great! I named it fixed-decimal in line with other crates, and if we decide to go with underscores in #304, we'll rename it together with all other crates.

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[sffc]

Thanks!