Merging in the PKCE functionality.

Fix client secret not being checked

Rfc6749 4.1.3 - client_secret isn't required

Suggestion: adding simple logging package and create utils section

It's likely that there might have be 2 of these functions or a switch involved

Allows client to use custom password verification

Added multi-key support in jwt mode

add context support

Typo

Removed checks done on ResponseType String()

There is no need to confirm the value of a type, and it makes it impossible to add additional Re...

get the actual username instead of the hard coded "000000"

List Firestore TokenStore implementation in the README.

Support access and refresh tokens that do not expire

if they haven't been explicitly configured

If the expiration duration is set to zero, the refresh tokens never
expire.

Add link to new implementation of token and client store for mysql db

User JWT standard claims

Added reference to PostgreSQL store implementation

Add GORM as a store implements

The type of key is different when SigningMethod is different.

Add XORM to docs as a store implements

add handle with duration

Initialize TokenInfo before invoking AccessGenerate.Token

Use the same code from this commit a305d018

Fixes #51

Fix error returning on LoadAccessToken in Manager

Fixed typo

add new storage implementation for AWS DynamoDB

Fix uuid package error

Fix uuid generation

fixed the token check

Set TokenInfo before Invoke AuthorizeGenerate

Because the oauth server need to get scope info when invoke AuthorizeGenerate and AccessGenerate