Add support for the table of contents block type

[mhall002]

Description

Adds support for the table of contents block type.

Fixes # (issue)
#180

Type of change

• New feature (non-breaking change which adds functionality)

How Has This Been Tested?

Added to the block integration tests following the divider changes as a guide.
If unit tests need to be added in addition to the integration ones let me know.

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
• 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
• I have checked my code and corrected any misspellings

[KoditkarVedant]

@mhall002 Changes LGTM. If you could resolve the conflicts by merging latest main branch. so, I can merge the PR.