acdh-oeaw / arche-core / #490

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Database connections optimization and HTTP 429 return code introduction

* Capture "too many connections" error and report it to the client as
  HTTP 429 too many requests. Add tests checking for this behavior.
* Initialize zozlak\auth\usersDb\PdoDb with the RestController::$pdo
  instead of creating a separate connection
* Search::post(): use the RestController::$pdo instead of creating a separate
  connection. Still execute "BEGIN TRANSACTION READ ONLY" on the
  RestController::$pdo to assure no data modifications can be made.
* Transaction - move the database connection initialization to a
  separate method - initPdo() - and call it only when the connection is
  needed.

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