Implement external-engine endpoints

[Anupya]

Description

• Create a new class ExternalEngineAnalysis because these 3 endpoints use a different URL and pertain to analyses which makes them functionally different from the endpoints in ExternalEngine which are just CRUD on external engine.
• Did not add a test as they are all POST endpoints

After merge

I believe with this PR, all the endpoints in #6 (that are possible to implement) have been implemented in the client! Please check all of them off and close the issue.

Checklist

Checklist when adding a new endpoint

• Added new endpoint to the README.md
• Ensure that my endpoint name does not repeat the name of the client. Wrong: client.users.get_user(), Correct: client.users.get()
• Typed the returned JSON using TypedDicts in berserk/types/, example
• Tested GET endpoints not requiring authentification. Documentation, example <-- not GET
• Added the endpoint and your name to CHANGELOG.md in the To be released section (to be created if necessary) <-- leaving it up to the maintainer

[kraktus]

Hey, haven’t forgotten about it, just still considering if it’s best to put it in the same client as external analysis or not

[kraktus]

@Anupya I think it’s best to put everything behind the external_engine client and handle the different base URL internally. iirc you said you started working again, so if you have no time will do it later.

[Anupya]

I am indeed busy at work again 🙏