Nym Statistics API (#5800)

* move stats types from vpn-client to here

* base stats api

* change storage schema

* add link to nymAPI for whitelisting

* remove outdated comment

* more comments update

* example of chrono vs time

* Add build.rs
- exports DATABASE_URL so cargo check works
- exports SQLX_OFFLINE for CI
- added pg_up.sh which spawns PG container
  - required for cargo sqlx prepare

* fixes time vs chrono issue and cleaner build with docker

* add correct swagger types, with feature locking where relevant

* apply dynco suggestions

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Co-authored-by: dynco-nym <173912580+dynco-nym@users.noreply.github.com>

.github/workflows/ci-build.yml

@@ -13,6 +13,7 @@ on:
       - 'nym-network-monitor/**'
       - 'nym-node/**'
       - 'nym-node-status-api/**'
+      - 'nym-statistics-api/**'
       - 'nym-outfox/**'
       - 'nym-validator-rewarder/**'
       - 'nyx-chain-watcher/**'