Missing or deprecated fields on the event protocol

[marandaneto]

Description

Relates to getsentry/team-mobile#56

DebugImage missing cpu_subtype and cpu_type.
Mechanism field meta isn't correctly typed, but it should be fine since it's iOS specific.
SentryApp missing app_memory, we likely set this one on SentryDevice, likely a confusion here between App's sandbox memory and Device memory.
SentryDevice Relay is missing screen_height_pixels and screen_width_pixels
SentryEvent deprecate culprit, missing errors but ideally not needed for SDKs, maybe useful for E2E tests.
SentryGpu missing graphics_shader_level, max_texture_size, supports_compute_shaders, supports_draw_call_instancing,
supports_geometry_shaders, supports_ray_tracing.
SentryRequest missing fragment, inferred_content_type, and SDK should deprecate/drop other.
SentryRuntime missing build, Relay is missing compiler.
SentryStackFrame missing stack_start, symbol, vars should be <string, any>, Relay is missing addr_mode, and frames_omitted.
SentryStackTrace missing lang, and snapshot.
SentryTraceContext missing client_sample_rate, exclusive_time, do we actually need them on the SDK?
SentryTransactionInfo, missing changes, original, propagations, do we actually need them on the SDK?
SentryUser, missing data <string, any>, geo, name.

[ueman]

Related: #842