Secure WebSocket connection with cookie authentication

[Shiranuit]

What does this PR do ?

This PR adds the support of cookie when using the websocket protocol. To do that, when Kuzzle cookieAuth option is true, Kuzzle will call the method enableCookieSupport from the given protocol. When called, this method will throw if outside the browser or if cookie are not supported by the protocol, otherwise this will change how the protocol behave.

For the HTTP protocol it's simple, when enableCookieSupport is called, the protocol will be changing if the request are made with withCredentials set to true or false depending if he should be able to receive cookies.

For the Websocket protocol, this is a bit more complex, when enableCookieSupport is called, the protocol, will be creating a instance of the HTTP Protocol, with the same option (host, port, ssl, ...) as the websocket protocol, after that, when a request auth:login, auth:logout or auth:refreshToken is made, the protocol will use the HTTP Protocol instead of the websocket client to make the request.
[ex: auth:login request is made -> websocket closes the connection -> then send the request with the http protocol -> when a response is received it reopens the connection -> then resolve the request]

TODO:

• HTTP integration in Websocket Protcol
• Unit Tests
• Documentation
• Add pictures to explain the changes in behaviour

[codecov]

Codecov Report

Merging #621 (14911c9) into 7-dev (9c5e37b) will decrease coverage by 0.55%.
The diff coverage is 71.92%.

@@            Coverage Diff             @@
##            7-dev     #621      +/-   ##
==========================================
- Coverage   86.86%   86.30%   -0.56%     
==========================================
  Files          34       34              
  Lines        1538     1585      +47     
  Branches      272      279       +7     
==========================================
+ Hits         1336     1368      +32     
- Misses        146      159      +13     
- Partials       56       58       +2     

Impacted Files	Coverage Δ
src/Kuzzle.ts	83.45% <33.33%> (-2.32%)	⬇️
src/protocols/WebSocket.ts	79.82% <83.33%> (+0.70%)	⬆️
src/protocols/Http.ts	83.13% <86.66%> (-1.01%)	⬇️
src/protocols/abstract/Base.ts	92.64% <100.00%> (+0.33%)	⬆️

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[Aschen]

Some comments, good job otherwise 👍

[Shiranuit]

Update:
When cookieAuth option is set to true in the Kuzzle constructor, this enables the autoResubscribe option to make sure that subscriptions are retrieved upon reconnection, along with offlineMode=auto to enable queuing and replaying the requests after the connection has been reestablished.