Extend on-demand field support

[obostjancic]

We need to extend the list of fields supported by on-demand with the following:

device.arch
device.battery_level
device.brand
device.charging
device.locale
device.online
device.orientation
device.screen_density
device.screen_dpi
device.screen_height_pixels
device.screen_width_pixels
device.simulator
device.uuid

platform.name

os.build
os.kernel_version

sdk.name
sdk.version

Tasks

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1. Adding fields support in Relay #58504
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2. Add fields mapping to the backend #58505
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3. Remove unsupported fields from the frontend #58507
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4. feat(event-schema): Add getters for most contexts in Discover relay#2607
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[jan-auer]

This list is missing the following fields:

• contexts.app.in_foreground
• contexts.unreal.crash_type

I'll be addressing this in getsentry/relay#2607