feat(isIBAN): add strip option

[dacalalic]

Adds an optional strip boolean to isIBAN:

• When strip is true (default), behavior is unchanged (whitespace/hyphens/non-alphanumerics are removed before validation).
• When strip is false, input is validated as-is (still uppercased), allowing callers to handle normalization themselves.

Updates:

• Code: minimal change in hasValidIbanFormat and hasValidIbanChecksum to respect options.strip.
• Tests: added cases for { strip: false } (no stripping) and with whitelist/blacklist combos.
• Docs: clarified JSDoc and README entry for isIBAN(str, options) to document strip (default true).

References
This change doesn’t modify the IBAN format or checksum; it only adds an optional strip flag (default true) to control input normalization.

Checklist

• PR contains only changes related; no stray files, etc.
• README updated (where applicable)
• Tests written (where applicable)
• References provided in PR (where applicable)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (6f436be) to head (e38f6fd).

Additional details and impacted files

@@            Coverage Diff            @@
##            master     #2605   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          114       114           
  Lines         2536      2539    +3     
  Branches       642       644    +2     
=========================================
+ Hits          2536      2539    +3     

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