feat(analyzer): Add AU bank details recognizer with tests

[randiratnayake]

Change Description

Added a new Australian bank details recognizer for Presidio Analyzer.

What this PR includes:

• New recognizer for AU bank details (entity: AU_BANK_DETAILS) that detects BSB + account number pairs.
• Structural validation logic to reduce false positives (valid BSB/account shape and basic plausibility checks).
• Export wiring so the recognizer is available through predefined recognizers.
• Registry wiring in default recognizer configuration (disabled by default, country code au).
• Documentation update in supported entities.
• Changelog update under unreleased analyzer additions.
• New unit tests covering valid formats and invalid/edge cases.

Checklist

• I have reviewed the contribution guidelines
• I agree to follow this project's Code of Conduct
• I confirm that I have the right to submit this contribution and that it does not knowingly contain proprietary or confidential code.
• My code includes unit tests
• All unit tests and lint checks pass locally
• My PR contains documentation updates / additions if required

[Copilot]

Pull request overview

Adds a new Presidio Analyzer predefined recognizer for Australian bank details (BSB + account number) and wires it into the predefined-recognizers exports, default registry configuration (disabled by default), documentation, changelog, and unit tests.

Changes:

• Introduces AuBankDetailsRecognizer (AU_BANK_DETAILS) with regex patterns plus structural validation.
• Wires the recognizer into predefined recognizers and default_recognizers.yaml (country_code au, disabled).
• Adds unit tests and updates docs/supported_entities.md and CHANGELOG.md.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
presidio-analyzer/presidio_analyzer/predefined_recognizers/country_specific/australia/au_bank_details_recognizer.py	Adds the AU bank details pattern recognizer + validation logic.
presidio-analyzer/tests/test_au_bank_details_recognizer.py	Adds unit tests for valid/invalid AU bank detail formats.
presidio-analyzer/presidio_analyzer/predefined_recognizers/country_specific/australia/init.py	Exports the new AU bank details recognizer from the Australia package.
presidio-analyzer/presidio_analyzer/predefined_recognizers/init.py	Exposes AuBankDetailsRecognizer via the top-level predefined recognizers module.
presidio-analyzer/presidio_analyzer/conf/default_recognizers.yaml	Registers the recognizer in the default registry (disabled, country_code: au).
docs/supported_entities.md	Documents the new AU_BANK_DETAILS supported entity.
CHANGELOG.md	Adds an “Unreleased” analyzer entry for the new recognizer.

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