Rename KuzzleRequest to RequestPayload

[Aschen]

What does this PR do?

Rename KuzzleRequest and KuzzleResponse to RequestPayload and ResponsePayload

Also move type definitions to types/

Those types are exactly the same as in Kuzzle.

[lgtm-com]

This pull request introduces 1 alert when merging 28c65a4 into 63f8fd2 - view on LGTM.com

new alerts:

• 1 for Superfluous trailing arguments

[codecov]

Codecov Report

Merging #565 (7fd0c4a) into master (76f3e5b) will increase coverage by 0.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master     #565      +/-   ##
==========================================
+ Coverage   88.34%   88.36%   +0.01%     
==========================================
  Files          32       32              
  Lines        1442     1444       +2     
  Branches      251      252       +1     
==========================================
+ Hits         1274     1276       +2     
  Misses        119      119              
  Partials       49       49              

Impacted Files	Coverage Δ
src/controllers/Auth.ts	75.64% <ø> (ø)
src/controllers/Base.ts	87.50% <0.00%> (ø)
src/controllers/Collection.ts	75.43% <ø> (ø)
src/controllers/Document.ts	71.59% <ø> (ø)
src/controllers/Realtime.ts	90.47% <ø> (ø)
src/core/searchResult/Document.ts	100.00% <ø> (ø)
src/core/searchResult/SearchResultBase.ts	77.19% <0.00%> (ø)
src/core/searchResult/Specifications.ts	100.00% <ø> (ø)
src/core/security/Profile.ts	100.00% <ø> (ø)
src/core/security/Role.ts	71.42% <ø> (ø)
... and 6 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 76f3e5b...7fd0c4a. Read the comment docs.