Add FXIOS-9962 - Add shared files from mozilla central for password generator

[issammani]

📜 Tickets

Jira ticket
Github issue

💡 Description

This PR:

• Adds LoginFormFactory.sys.mjs which is a utiliy to deal with forms and inputs on a document.
• Adds NewPasswordModel.sys.mjs which a pre-trained fathom model to detect new-password fields.
• Adds PasswordGenerator.sys.mjs which is used to generate the secure passwords based on rules.
• Adds PasswordRulesParser.sys.mjs which will parse the rules from RemotePasswordRules.json.
• Adds LoginManager.shared.sys.mjs which has shared utils from the password manager.

📝 Checklist

You have to check all boxes before merging

• Filled in the above information (tickets numbers and description of your work)
• Updated the PR name to follow our PR naming guidelines
• Wrote unit tests and/or ensured the tests suite is passing
• When working on UI, I checked and implemented accessibility (minimum Dynamic Text and VoiceOver)
• If needed, I updated documentation / comments for complex code and public methods
• If needed, added a backport comment (example @Mergifyio backport release/v120)

[isabelrios]

There is a unit test failure in this PR: test_didTapMainButton_withSaveState_callsAddCreditCard
if it is not related to the changes, you may need to re-run it again

[mobiletest-ci-bot]

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