fix: use user id and anonymous id as segment identity MONGOSH-1143

[alenakhineika]

In mongosh, we don't have MongoDB user identifiers. We randomly generate an ID the first time the product is run and then we use that as a user id. The userId should not be a random UUID, it should store only AUID. The randomly generated UUID should be sent as anonymousId.

To not break statistics for existing users:

• We should leave all current users with the tracking they have.
• For new users, we should use the anonymousID field and fill it with a random UUID.

That being said:

• If userId exists we send it to segment. We also copy userId to anonymousId and send it to Segment as well.
• If userId does not exist we do not create a new one, we only generate a random UUID and send it to Segment as anonymousId.

[addaleax]

Looks good, might be nice to also have somebody take a look who reviewed the vscode/compass variants of this tho

[addaleax]

Also, I think the test failure in the types package might be related:

[2022/03/10 12:15:38.129]   1) config validation
[2022/03/10 12:15:38.129]        validates config option values:
[2022/03/10 12:15:38.129]      AssertionError: expected null to equal undefined
[2022/03/10 12:15:38.129]       at Context.<anonymous> (src/index.spec.ts:7:48)

[mcasimir]

👍