Allow login to automatically pull from env vars

[ThomasLaPiana]

Closes #2786

Code Changes

• add the user.username and user.password fields to the config
• update fides user login to pull from the config automatically if the options aren't specified, finally falling back on prompting if not provided as an option and not in the config
• update fides user create to use username and password arguments instead of options, display assigned roles upon successful creation
• add the username and password to the development config file

Steps to Confirm

• confirm that the user.username and user.password fields are set in the fides.toml:
  • run fides user login and confirm "it just works"
  • run fides user login -u notarealuser and confirm it breaks
• remove the user.username and user.password fields from the fides.toml
  • run fides user login and confirm it prompts for them
• fides user create newuser Testpassword1! is successful and shows the assigned roles (always owner currently)

Pre-Merge Checklist

• All CI Pipelines Succeeded
• Documentation:
  • documentation complete, PR opened in fidesdocs -> CLI Auth Documentation PR
  • documentation issue created in fidesdocs
• Issue Requirements are Met
• Update CHANGELOG.md
• Relevant Follow-Up Issues Created
• For API changes, the Postman collection has been updated

Description Of Changes

This PR is designed to make logging in via the CLI more user-friendly. It allows users to set a username and password via the config file (and therefore via env vars if so inclined) that will get automatically used during the login process.

It should be noted that username/password are considered discrete values here, so one may configure their username via the config file and it will still prompt for the password

Login Logic Update

The new priority list is as follows:

1. If a username/password option is provided directly, use that value
2. If no flags are provided, check the config (which would automatically load env vars as well, such as FIDES__USER__USERNAME)
3. If no option was provided and the config is empty, prompt the user for the value

Example Config Section

[user]
username = "root_user"
password = "password

[cypress]

Passing run #978 ↗︎

0	3	0	0	0
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Details:

Merge edd3e43 into dfabd1d...
Project: fides	Commit: 068752d230 ℹ️
Status: Passed	Duration: 00:33 💡
Started: Mar 24, 2023 4:51 AM	Ended: Mar 24, 2023 4:52 AM

_{This comment has been generated by cypress-bot as a result of this project's GitHub integration settings.}

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +19.33 🎉

Comparison is base (50b836c) 67.30% compared to head (edd3e43) 86.63%.

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #2884       +/-   ##
===========================================
+ Coverage   67.30%   86.63%   +19.33%     
===========================================
  Files         299      299               
  Lines       16814    16831       +17     
  Branches     2148     2148               
===========================================
+ Hits        11316    14581     +3265     
+ Misses       5093     1841     -3252     
- Partials      405      409        +4     

Impacted Files	Coverage Δ
src/fides/cli/utils.py	65.89% <ø> (ø)
src/fides/cli/commands/user.py	100.00% <100.00%> (ø)
src/fides/cli/options.py	95.60% <100.00%> (+3.39%)	⬆️
src/fides/core/config/__init__.py	95.50% <100.00%> (+13.48%)	⬆️
src/fides/core/config/user_settings.py	100.00% <100.00%> (ø)
src/fides/core/user.py	97.33% <100.00%> (+0.03%)	⬆️

... and 133 files with indirect coverage changes

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[TheAndrewJackson]

I like this improvement! Everything worked great 🚀