Add support for trimming strategies

[Dakrs]

Description

Added support for distinct trim strategies. Currently, there are 3 strategies supported: redact, trim, and trim-and-list.

• redact : default behaviour. Obfuscated properties are kept in the output object with the replacement value.
• trim: Deletes the obfuscated properties in the output when the replacement value is the default value.
• trim-and-list: Same behaviour as trim, but a list with all obfuscated properties is provided in the output object.

Usage example:

const anonymize = anonymizer({ whitelist: ['foo'] }, { strategy: 'trim-and-list' });
anonymize({ biz: 'baz', buz: { bux: { qux: 'quux' } }, foo: 'bar' })

output:
{ __redacted__: ['biz', 'buz.bux.qux'], foo: 'bar' }

BKO-3790

[rbrtribeiro]

Add support for trimming strategies.