feat: Add support for browser authentication

[dlouseiro]

The purpose of this PR is to add support for SSO authentication via external browser (documented here).

As I detailed in this issue, while the most common authentication methods used for production users (Snowflake service account) are basic authentication (user/password) and RSA key-pair authentication, local executions can be done with personal users which, in some companies' Snowflake setup don't have a password, but can only authenticate via SSO (using an external browser).

Implementation details:

• Add new configuration property use_browser_authentication, which defaults to false (added to README.md, meltano.yml and target_snowflake/target.py)
• Added secure-local-storage extra to the snowflake-connector-python (needed for SSO tokens to be cacheable - documented here)
• Update poetry.lock
• Add settings_group_validation for the three possible flows: user/password, user/private_key_path and user/use_browser_authentication

Closes https://github.com/MeltanoLabs/target-snowflake/issues/203

[dlouseiro]

FYI, this is my first PR in this repo (or in any other repo from MeltanoLabs so I may have something missing). Would of course appreciate some help from the reviewers to guide me in the right direction!

[edgarrmondragon]

@dlouseiro thanks for contributing! Would you mind rebasing your branch to the latest main?

[dlouseiro]

@dlouseiro thanks for contributing! Would you mind rebasing your branch to the latest main?

Sure, will do!

[dlouseiro]

@dlouseiro thanks for contributing! Would you mind rebasing your branch to the latest main?

Sure, will do!

DOne @edgarrmondragon