fix: support persisted views for cloud catalog

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TL;DR

Implemented view support for the CloudCatalog, enabling creation, listing, description, and deletion of views in the cloud backend.

What changed?

• Added view management functionality to the CloudCatalog class

• Refactored common functionality since views and tables are datasets:

  • Created _drop_dataset() to handle both table and view deletion
  • Renamed _get_tables_for_database() to _get_datasets_for_database() to handle both tables and views

• Added utility functions for converting between bytes and strings to be used in Serde:

  • get_string_from_bytes() and get_bytes_from_string()
  • Standardized base64 encoding/decoding across the codebase

• Have separate error codes for Views:

  • ViewAlreadyExistsError
  • ViewNotFoundError

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Warning

This pull request is not mergeable via GitHub because a downstack PR is open. Once all requirements are satisfied, merge this PR as a stack on Graphite.
Learn more

• fix: support persisted views for cloud catalog #147 👈 (View in Graphite)
• fix: use the cloud catalog when doing save_as_table in a cloud session #91 : 1 other dependent PR (#94 )
• fix: make catalog use sc method to implement does_table_exist #90
• main

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[bcallender]

looks fine, just a couple minor nits