Adding DictionaryPage properties to EncodingProperties

[argmarco-tkd]

Adding DictionaryPage properties to EncodingProperties

Two properties belonging to Dictionary Pages were missing from EncodingProperties. In this PR we add them. These are the properties:

• Dictionary Page NumValues (dict_page_num_values)
• Dictionary Page "is sorted" (optional) (dict_page_is_sorted)

Testing

• Existing and modified unit tests pass (via ctest -L parquet)
• Successful manual testing using base_app.py (both for non-dictionary pages and dictionary pages).

[github-actions]

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See also:

• Other pull requests
• Contribution Guidelines - Contributing Overview

[avalerio-tkd]

LGTM. Thanks for adding this!