chore: [IOPAE-1090] Add `handleFindInstitutions` saga

[adelloste]

This pr depends on https://github.com/pagopa/io-app/pull/5701

Short description

This PR adds the saga generator to get paginated institutions.

List of changes proposed in this pull request

• Added handleFindInstitutions saga
• Added autogenerated client
• Added tests

How to test

Tests should be solved properly

[pagopa-github-bot]

Affected stories

• ⚙️ IOPAE-1090: [APP] Implementare saga institutions subtask of
  • 🌟 IOPAE-1034: [MVP0] Come cittadino voglio vedere tutta la lista degli enti Nazionali nella sezione Servizi

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[dpulls[bot]]

:tada: All dependencies have been resolved !