Fix exposed object properties

[scottinet]

Description

• expose the missing object properties expected by the current SDK specifications, with the right read/write attributes
  • kuzzle object:
    • autoQueue (writable)
    • autoReconnect (changed to read-only)
    • autoReplay (writable)
    • host (read-only)
    • offlineQueue (changed to read-only)
    • offlineQueueLoader (writable)
    • port (read-only)
    • queueFilter (writable)
    • queueMaxSize (writable)
    • queueTTL (writable)
    • replayInterval (writable)
    • reconnectionDelay (changed to read-only)
    • sslConnection (read-only)
  • Room object:
    • roomId is now a read-only property, and is not used as an internal flag to check if a subscription is active. Instead, a new private active boolean property has been added for that purpose
    • scope, state and users are now enumerable
    • autoResubscribe is now read-only, as is the same property from the Kuzzle main object
• remove the now obsolete headers property from all objects

[codecov-io]

Codecov Report

Merging #259 into 6.x will decrease coverage by 0.26%.
The diff coverage is 91.89%.

@@            Coverage Diff             @@
##              6.x     #259      +/-   ##
==========================================
- Coverage   98.59%   98.32%   -0.27%     
==========================================
  Files          17       17              
  Lines        2134     2210      +76     
  Branches      618      645      +27     
==========================================
+ Hits         2104     2173      +69     
- Misses         30       37       +7

Impacted Files	Coverage Δ
src/Document.js	98.97% <ø> (-0.05%)	⬇️
src/CollectionMapping.js	97.56% <100%> (-0.17%)	⬇️
src/Collection.js	100% <100%> (ø)	⬆️
src/Room.js	100% <100%> (ø)	⬆️
src/networkWrapper/protocols/abstract/realtime.js	98.63% <100%> (-0.69%)	⬇️
src/MemoryStorage.js	99.42% <100%> (+0.38%)	⬆️
src/Kuzzle.js	97.44% <88.88%> (-1.08%)	⬇️

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