(DOCSP-31928): Implement numbered lists

[cbush]

Jira: https://jira.mongodb.org/browse/DOCSP-31928

Changes

• Cleans up the implementation of snootyAstToMd somewhat -- removes unnecessary state variable (text) and consolidates state in one argument passed to internal implementation function.
• Adds numbered list support

Notes

• No idea why 'arabic' is the type for ordered lists in snooty

[nlarew]

Seeing a couple of test errors (timeouts and GH rate limiting) + these build errors in test files:

➡ npm run build

> ingest@0.0.6-0 build
> tsc -b

src/renderSnootyTable.test.ts:15:54 - error TS2554: Expected 1 arguments, but got 2.

15     const result = renderSnootyTable(sampleTableAst, 0);
                                                        ~

src/renderSnootyTable.test.ts:109:43 - error TS2554: Expected 1 arguments, but got 2.

109     const result = renderSnootyTable(ast, 0);
                                              ~

Found 2 errors.