fix: AMP-57521-EventOptions

[Mercy811]

Summary

• consistent with other SDKs
• 35 fields in total

Checklist

• [x] Does your PR title have the correct title format?
• Does your PR have a breaking change?:

[kevinpagtakhan]

Question: In typescript, the BaseEvent class extends the EventOptions class. So the keys in EventOptions are at the same level as event_type / event_properties and etc. https://github.com/amplitude/Amplitude-TypeScript/blob/main/packages/analytics-types/src/base-event.ts#L11

In go here, we have another key for EventOptions in the Event struct. Are those two align?

https://github.com/amplitude/Amplitude-Go/pull/10/files#diff-6caf76ab3481a2e4beb6ba9a3c720ba47735829fbe9e6dab9279edae8249de48L23

I think Go does not have inheritance like other languages do; and this is the closest thing in Go.