Types and improvements

[ctrl-f5]

Build on #61 and adds some additional improvements. Separated in a new PR because they are not all BC (if people have extended classes they must also add the new type info).

• renamed DiscoveryMethodInterface to DiscoveryMethod analog to how Adaptor is set up
• extracted server config (issuer, metadata and jwks loading) from verifier
• added unit tests for almost every class, including ssl certificate parsing
• added namespacing for unit tests
• added type info where possible, added docblocks where possible
• consistent spaces in if and foreach
• added docker file to run tests locally
• updated README

[codecov-io]

Codecov Report

Merging #62 (3c06483) into develop (e432999) will increase coverage by 59.07%.
The diff coverage is 92.70%.

@@              Coverage Diff               @@
##             develop      #62       +/-   ##
==============================================
+ Coverage      33.77%   92.85%   +59.07%     
- Complexity        98      110       +12     
==============================================
  Files              9       10        +1     
  Lines            225      238       +13     
==============================================
+ Hits              76      221      +145     
+ Misses           149       17      -132     

Impacted Files	Coverage Δ	Complexity Δ
src/Server/Discovery/Oauth.php	100.00% <ø> (ø)	1.00 <0.00> (?)
src/Adaptor/AutoDiscover.php	66.66% <50.00%> (ø)	4.00 <0.00> (?)
src/Adaptor/FirebasePhpJwt.php	84.50% <84.61%> (ø)	26.00 <26.00> (?)
src/Server/DefaultServer.php	91.17% <91.17%> (ø)	18.00 <18.00> (?)
src/Jwt.php	95.23% <93.75%> (+95.23%)	11.00 <7.00> (ø)
src/JwtVerifier.php	100.00% <100.00%> (+63.41%)	19.00 <16.00> (-3.00)	⬆️
src/JwtVerifierBuilder.php	100.00% <100.00%> (+32.00%)	19.00 <15.00> (ø)
src/Request.php	100.00% <100.00%> (ø)	9.00 <0.00> (ø)
src/Server/Discovery/DefaultDiscovery.php	100.00% <100.00%> (ø)	2.00 <2.00> (?)
src/Server/Discovery/Oidc.php	100.00% <100.00%> (ø)	1.00 <1.00> (?)
... and 5 more

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[bretterer]

Thank you for the PR, we would need to have you sign a cla for this to be merged in after we do our internal review.

You can begin the cla process now by visiting developer.okta.com/cla

[ctrl-f5]

I have sent in the CLA, not sure how it will be linked to my github account though

[bretterer]

Thanks @ctrl-f5 we manage the CLA's externally right now. I see the CLA and will add this PR to our tasks to look at and possibly be merged in