Add API key methods

[Aschen]

What does this PR do?

Add the following methods:

• security:createApiKey
• security:deleteApiKey
• security:searchApiKeys
• auth:createApiKey
• auth:deleteApiKey
• auth:searchApiKeys

Other changes

• update docker-compose to use elasticsearch:7 meta tag
• fix refresh argument to accept refresh: false

[codecov]

Codecov Report

Merging #478 into 7-dev will decrease coverage by 0.02%.
The diff coverage is 94.44%.

@@            Coverage Diff             @@
##            7-dev     #478      +/-   ##
==========================================
- Coverage   96.02%   95.99%   -0.03%     
==========================================
  Files          32       32              
  Lines        1282     1298      +16     
==========================================
+ Hits         1231     1246      +15     
- Misses         51       52       +1

Impacted Files	Coverage Δ
src/controllers/security/index.js	99.25% <100%> (+0.04%)	⬆️
src/controllers/auth.js	93.54% <100%> (+0.95%)	⬆️
src/Kuzzle.js	94.04% <50%> (-0.43%)	⬇️

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[scottinet]

Food for thoughts: I wonder if instead of this, we should link to the underlying API method instead

[Aschen]

I remember that we already discuss about adding a link to the original API on each SDK method.
But why did you say that about the Since badge?

[scottinet]

Because we don't need it if we have links to the underlying API. Moreover, I don't like having to maintain since badges in multiple places, I'd prefer to have only to worry about those badges in the API section of the documentation when updating an API feature.