* Document and support the established naming convention for config opts
This change:
* Rename `ConfigOptions` to `IConfigOptions` to match code convention/style, plus move it to a dedicated file
* Update comments and surrounding documentation
* Define every single documented option (from element-web's config.md)
* Enable a linter to enforce the convention
* Invent a translation layer for a different change to use
* No attempt to fix build errors from doing this (at this stage)
* Add demo of lint rule in action
* Fix all obvious instances of SdkConfig case conflicts
* Fix tests to use SdkConfig directly
* Add docs to make unset() calling safer
* Appease the linter
* Update documentation to match snake_case_config
* Fix more instances of square brackets off SdkConfig
* Add matrix-analytics-events as a dependency
* Make IEvent look like a stub definition
* Update pageview tracking to track screens, using a hypothetical definition of a screen event
* Remove distinction between pseudo and anon tracking, will need to rework it considering stubs
* Redact and pass the redacted url as a property. redactedCurrentLocation might have issues with concurrent events
* Remove DNT code and rely on posthog
* Make it an error to call it before its initialised, and separately track whether its been enabled
* Use anonmity enum in the public interface
* Properly await upstream calls
* Fix accidental test fixture cross-reliance
