feat: multi strategy

[pi0]

After talking with @breakingrobot we decided to keep this enhancement 100% 99.99 backward compatibles as we are now in rc phase.

This is our first step for built-in OAuth support! 🍷

What have been changed:

• Templates renamed.
• Auth class is fully refactored abstracted from authentication schemes. Only small utils are remaining.
• New universal helper methods.
• Current authentication logics moved into default local scheme.

Terminology:

• Scheme: A generic auth flow implementation. Like GitHub, password-based, etc
• Strategy: A configured scheme instance
• Local: The default auth strategy with default local scheme and compatibility with current options.

Task list:

• initial refactor
• ensure tests passing
• make strategies dynamic configurable
• update the docs
• support custom strategies
• add some more strategies
• [ ] a wiki page for how-to implementing strategies

As this is an almost big change, using branch to review changes is better.

[codecov]

Codecov Report

Merging #61 into master will decrease coverage by 2.89%.
The diff coverage is 80.55%.

@@            Coverage Diff            @@
##           master      #61     +/-   ##
=========================================
- Coverage   86.95%   84.05%   -2.9%     
=========================================
  Files           4        4             
  Lines          46       69     +23     
  Branches        6       12      +6     
=========================================
+ Hits           40       58     +18     
- Misses          6       10      +4     
- Partials        0        1      +1

Impacted Files	Coverage Δ
test/fixtures/basic/nuxt.config.js	100% <ø> (ø)	⬆️
lib/defaults.js	100% <ø> (ø)	⬆️
examples/api/auth.js	83.33% <ø> (ø)	⬆️
lib/module.js	83.33% <80.55%> (-6.15%)	⬇️

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[pi0]

@breakingrobot codecov always adds a comment (or edit it if available) we can't do anything for that :D

[syffs]

I've tried adding a facebook scheme, not sure I got it right though...

SSR is not working and I'm not sure how accessToken is supposed to be sent back to the server. Any insight?

I also though about implementing this without SDK not sure what is the preferred way..

[pi0]

@syffs I've moved your request into new issue #73 to track it easier.