fix: refactor background observers and event listeners

[CaptainJeff]

Description

This is the work described in #233 where the background observers

Instead of creating four event listeners for every measurement type that you want to listen for in the background

NativeAppEventEmitter.addListener('healthKit:HeartRate:setup:success', callback)
NativeAppEventEmitter.addListener('healthKit:HeartRate:new', callback)
NativeAppEventEmitter.addListener('healthKit:HeartRate:setup:failure', callback)
NativeAppEventEmitter.addListener('healthKit:HeartRate:failure', callback)

We can now just create five event listeners for all measurements and pass the type as a parameter

NativeAppEventEmitter.addListener('healthKit:new', callback)
NativeAppEventEmitter.addListener('healthKit:failure', callback)
NativeAppEventEmitter.addListener('healthKit:enabled', callback)
NativeAppEventEmitter.addListener('healthKit:setup:failure', callback)
NativeAppEventEmitter.addListener('healthKit:setup:success', callback)

eventListener = eventEmitter.addListener(`healthKit:new`, (type) => {
   // Inspect the measurement type (workout, heartrate, etc...)
})

This PR also includes support for several new measuremetns including

• BodyMass
• BodyFatPercentage
• BodyTemperature
• BloodGlucose
• BloodPressureDiastolic
• BloodPressureSystolic
• OxygenSaturation
• RespiratoryRate

Fixes 233 - Unnecessary event listeners from being created

Type of change

Please delete options that are not relevant.

• New feature (non-breaking change which adds functionality)
• This change requires a documentation update

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have made corresponding changes to the documentation
• I have checked my code and corrected any misspellings

[CaptainJeff]

@GGGava let me know if you have any questions about this PR

[GGGava]

Hey @CaptainJeff thank you for your PR, I will take a look at it soon, sorry for the delay

[CaptainJeff]

Hey @GGGava any update on reviewing this PR?

[GGGava]

Hey @CaptainJeff sorry for not reviewing it yet. We are currently working on a major refactor of this library (no more objective-c 🚀 ). We will probably release it under a new major version, so I'm currently avoiding changes to the current API. I still haven't thought about the observers in the new version yet, but I'll get there shortly.

[brandon-austin-lark]

@GGGava can we get some eyes on this please?