Support assistant.search.* APIs

[DominicRoyStang]

Package

@slack/web-api

Description

The following two endpoints aren't set up in @slack/web-api:

• https://docs.slack.dev/reference/methods/assistant.search.context
• https://docs.slack.dev/reference/methods/assistant.search.info

I would be nice to be able to use these via this library.

Alternatives Considered

We can use fetch for these API calls as a workaround in the meantime.

[github-actions]

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[markb-trustifi]

The client.assistant.search doesn't exist yet in @slack/bolt v5 despite that it is mentioned in docs.
Please add it to the source code.