fix: Disallow additional properties to be added in the filter config

[jjtang1985]

Context

This PR contains:

• Fix the FilterConfig to disable additional properties.

• Rename FilterConfig to InputFilterConfig and OutputFilterCOnfig

• wait for fix: Use types instead of interfaces #274 first.

Definition of Done

• Code is tested (Unit, E2E)
• (Optional) Release notes updated

[deekshas8]

Unrelated to this PR, but I realized this util function returns filters: [{ ... }] instead of just the azure filter config. If we ever have another safety service, the user would have to do:

input: {
  filters: [
    ...buildAzureContentFilter({ Hate: 0 }).filters,
    ...builderSomeOtherFilter({ key: 'value2' }).filters
  ]
};

[jjtang1985]

Good point.
Maybe until then, the schema will be changed again and we can reconsider the UX 😄