Rename text property of blocks to rich_text

[KoditkarVedant]

Description

Renamed the text property to rich_text. This affects the following block types: paragraph, heading_1, heading_2, heading_3, callout, quote, bulleted_list_item, numbered_list_item, to_do ,toggle, code ,template.

Fixes # (issue)
#242

Type of change

• Breaking change (Feature that would cause existing functionality to not work as expected)

How Has This Been Tested?

Updated the integration tests

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings