Data and provider for compact decimal formatting

[eggrobin]

Towards #1267.

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[eggrobin]

CI fails because of Swahili. Supporting ; etc. would make things very messy, but that pattern should really be simplified to elfu 0, with the minus sign coming from the significand.

WARN  [icu_provider::error] ICU4X data error: Could not create compact decimal patterns: Multiple placeholders in compact decimal pattern elfu 0;elfu -0
WARN  [icu_provider::error] ICU4X data error: Could not create compact decimal patterns: latn
WARN  [icu_provider::error] ICU4X data error: Could not create compact decimal patterns (key: compactdecimal/long@1, request: sw)

[robertbastian]

We had a similar issue in the list formatter, we fixed it in CLDR and added a special case in datagen.

[Manishearth]

Yes, for both this and the scientific stuff we should just add some fixup hacks in datagen until cldr gets fixed

[sffc]

Please merge in main so that you can use iter1_copied

[eggrobin]

Please merge in main so that you can use iter1_copied

I did, and I cannot, see #2897 (comment); reinstated into_iter1 on @Manishearth’s advice.

[codecov-commenter]

Codecov Report

Merging #2883 (061953d) into main (346d1a2) will increase coverage by 0.12%.
The diff coverage is 82.28%.

@@            Coverage Diff             @@
##             main    #2883      +/-   ##
==========================================
+ Coverage   73.66%   73.78%   +0.12%     
==========================================
  Files         458      464       +6     
  Lines       39185    39596     +411     
==========================================
+ Hits        28866    29217     +351     
- Misses      10319    10379      +60     

Impacted Files	Coverage Δ
experimental/compactdecimal/src/error.rs	0.00% <0.00%> (ø)
provider/datagen/src/registry.rs	40.00% <ø> (ø)
provider/datagen/src/transform/cldr/decimal/mod.rs	86.00% <ø> (+5.60%)	⬆️
provider/testdata/data/baked/any.rs	6.31% <ø> (ø)
provider/testdata/data/baked/mod.rs	78.03% <ø> (ø)
experimental/compactdecimal/src/provider.rs	55.00% <55.00%> (ø)
...r/datagen/src/transform/cldr/cldr_serde/numbers.rs	62.33% <58.06%> (-2.88%)	⬇️
...ider/datagen/src/transform/cldr/decimal/compact.rs	74.72% <74.72%> (ø)
...ider/datagen/src/transform/cldr/decimal/symbols.rs	76.36% <76.36%> (ø)
.../transform/cldr/decimal/compact_decimal_pattern.rs	96.68% <96.68%> (ø)
... and 4 more

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[sffc]

LGTM but let's make another PR to remove into_iter1 again

[sffc]

LGTM but let's make another PR to remove into_iter1 again

Never-mind: All OK