Implement `getById` procedure in `floatingIpRouter.ts`

[vlad-schur-external-sap]

Context:

This implements the floatingIp.getById.useQuery({ floatingIpId }) – Fetch the floating IP details so we can display detailed information about a single floating IP on corresponding page network/floating-ips/$floatingIpId/index.tsx

Acceptance Criteria:

• GetById fetch data about a single floatingIP from OpenStack API with all details