refactor(finance): deprecate maskedNumber for removal

[ST-DDT]

Fixes #2504

• Deprecate finance.maskedNumber for removal #2504

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The masking of important information is usually implemented in the application itself, so there is no need for us to provide a method ourselves.
This is especially true, since the method has lots of options and would need even more to actually represent real masked data.

As a workaround, you can use the following:

• faker.finance.creditCardNumber().replaceAll(/(?<=.{4}).(?=.{2})/g, '*')
• faker.finance.iban().replaceAll(/(?<=.{4})\w(?=.{2})/g, '*')

Popularity-Data from #3215

• faker.finance.maskedNumber: 59

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.96%. Comparing base (9abaed1) to head (2f7b0aa).
Report is 1 commits behind head on next.

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #3201      +/-   ##
==========================================
- Coverage   99.96%   99.96%   -0.01%     
==========================================
  Files        2805     2805              
  Lines      217129   217136       +7     
  Branches      976      973       -3     
==========================================
+ Hits       217055   217059       +4     
- Misses         74       77       +3     

Files with missing lines	Coverage Δ
src/modules/finance/index.ts	100.00% <100.00%> (ø)

... and 2 files with indirect coverage changes

[xDivisionByZerox]

Dispite my comment in #3202, I think deprecating this method is valid:

1. Proofen low to none actual use
2. The utility this method provides is arguably confusing and niche