refactor(locale)!: use snake case for all locale data

[ST-DDT]

Standardize file naming convention for the renaming locale files.

old	replacement
faker.definitions.science.chemicalElement	faker.definitions.science.chemical_element
faker.definitions.system.directoryPaths	faker.definitions.system.directory_paths
faker.definitions.system.mimeTypes	faker.definitions.system.mime_types

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This is an attempt an fixing some TODOs in our sources.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.95%. Comparing base (b97984c) to head (425f1c7).

Additional details and impacted files

@@           Coverage Diff           @@
##             next    #2910   +/-   ##
=======================================
  Coverage   99.95%   99.95%           
=======================================
  Files        2977     2977           
  Lines      215421   215421           
  Branches      948      951    +3     
=======================================
+ Hits       215327   215333    +6     
+ Misses         94       88    -6     

Files	Coverage Δ
src/locales/base/system/directory_paths.ts	100.00% <ø> (ø)
src/locales/base/system/index.ts	100.00% <100.00%> (ø)
src/locales/base/system/mime_types.ts	100.00% <ø> (ø)
src/locales/en/science/chemical_element.ts	100.00% <ø> (ø)
src/locales/en/science/index.ts	100.00% <100.00%> (ø)
src/locales/eo/science/chemical_element.ts	100.00% <ø> (ø)
src/locales/eo/science/index.ts	100.00% <100.00%> (ø)
src/locales/nb_NO/science/chemical_element.ts	100.00% <ø> (ø)
src/locales/nb_NO/science/index.ts	100.00% <100.00%> (ø)
src/locales/pl/science/chemical_element.ts	100.00% <ø> (ø)
... and 5 more

... and 1 file with indirect coverage changes

[xDivisionByZerox]

Why do we couple file anme and property key anyway? The propblem I have right now is that we have locale entries which might be lists of objects which intern have property keys as well. These are not considered in the PR. For example, look at en/airline/airline which is types as a list of Airline. It has the property iataCode, which is camelCase. So what I can do is faker.helpers.fake('airline.airline.iataCode') which contradictes the statement from the migration guide:

All our locale data now use the snake_case naming scheme.

[ST-DDT]

Why do we couple file name and property key anyway?

Because the index files that merge them are generated.

We could transform the property keys in between, but it would be a massive breaking change. Sure we could do that, but we should talk about it first.

[ST-DDT]

If you are just concerned about the wording, I can change it to refer to locale categories and entries specifically.

[xDivisionByZerox]

If you are just concerned about the wording, I can change it to refer to locale categories and entries specifically.

Thats propably it for me. Alternativly we could actually make all properties snake_case. The definition properties which are not "correctly" cased right now (ignoring the ones from this PR) are:

• airline.airline.iataCode
• airline.airport.iataCode
• internet.http_status_code.clientError
• internet.http_status_code.serverError
• science.chemical_element.atomicNumber