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Add Zerion Balances provider (#1096)

* Three new environment variables are introduced:
  - `ZERION_BASE_URI`: contains the base URI for the Zerion API. Has a default value in the configuration.
  - `ZERION_API_KEY`: contains the API key for the Zerion API. Defaults to `undefined`. This is done on purpose as it shouldn't be needed to provide an API key for each potential provider the CGW uses (moreover considering the provider could be not managing any chain at a given point in time). 
  - `FF_ZERION_BALANCES_CHAIN_IDS`: as stated above, this manages the chains that are associated with the Zerion API for balance retrieval. The expected values are comma-separated numbers (e.g.: `1,100,137`)
* Zerion-specific configuration is added to `configuration.ts` under the key `balances.providers.zerion`.
* Zerion-specific entities, and `ZerionBalancesApi` (with tests) have been added.
* `BalancesController` tests have been extended to test the new integration.

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