Support AddSuggestion API and add an example

[dpup]

What's this PR do?

Adds the AddSuggestion endpoint to the API

Where should the reviewer start?

Diff

Any background context you want to provide?

There's also some changes that were required for the NPM push that I forgot to
commit.

What are the relevant tickets?

Screenshots (if appropriate)

What gif best describes this PR or how it makes you feel?

Definition of Done:

• Code is easy to understand and conforms with Prettier & eslint configs
• Incomplete code is marked with TODOs
• Code is suitably instrumented with logging and metrics
• Documentation has been updated as appropriate
• Manifest has been updated and version incremented correctly
• OWASP Top 10 have been considered

[dpup]

@chrisforrette ping :)