feat: Issuer multi-tenancy support

[rolsonquadras]

closes #46

Signed-off-by: Rolson Quadras rolson.quadras@securekey.com

[codecov]

Codecov Report

Merging #55 into master will decrease coverage by 0.00%.
The diff coverage is 88.40%.

@@            Coverage Diff             @@
##           master      #55      +/-   ##
==========================================
- Coverage   88.12%   88.11%   -0.01%     
==========================================
  Files          14       15       +1     
  Lines         741      808      +67     
==========================================
+ Hits          653      712      +59     
- Misses         47       52       +5     
- Partials       41       44       +3     

Impacted Files	Coverage Δ
pkg/restapi/issuer/operation/operations.go	89.47% <86.36%> (-4.65%)	⬇️
pkg/profile/issuer/profile.go	91.66% <91.66%> (ø)
cmd/adapter-rest/startcmd/start.go	82.00% <100.00%> (+0.07%)	⬆️

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[llorllale]

Issuer and RP adapter's strategies for persistence has diverged. We need to get aligned. Let's discuss.

[llorllale]

Let's pursue NoSQL:

• allows more agile development
• NoSQL DBs scale out better. Although we're using MySQL as a backend store (for now), it'd be easier to switch to a native NoSQL solution if we used these K-V interfaces.
• NoSQL DBs generally have built-in clustering support. SQL clusters are not trivially set up.
• Team mostly has experience with NoSQL already (CouchDB)
• Data model seems small, so the cost of duplication should be lower, allowing the use of NoSQL

Of course, there are downsides to NoSQL as well. And I don't think our data model really benefits from NoSQL.