ulid implementation being used doesn't support web workers where `window` doesn't exist

[flothjl]

ulid monotonicFactory is being used by EventLogLevel https://github.com/TBD54566975/dwn-sdk-js/blob/0e3bc291e532b2e7afb1bbc1e17e901508dd1f76/src/event-log/event-log-level.ts#L34. The ulid implementation being used only looks for window when determining whether or not it's in the browser https://github.com/ulid/javascript/blob/a5831206a11636c94d4657b9e1a1354c529ee4e9/lib/index.ts#L118-L121. This causes issues in the case of a web worker where window doesn't exist.

Note - this has been brought up a few times in this ULID implementation's repo (example).

[thehenrytsai]

Fix is now merged.