initial Telemetry Processor JS Implementation

[linear]

https://develop.sentry.dev/sdk/telemetry/telemetry-processor/

• Bucket and SingleItem Ring Buffers for telemetry data buffering
• Prioritized rate-limit/backpressure managing TelemetryProcessor
• Refactor Transport interaction (SDKs talk to TP, not directly to Transport)
• Investigate different Browser SDK vs SSJS SDKs (is Browser/Electron more like Mobile?)

Provide feedback to TelemetryProcessor design as uncovered by implementation. (All SDKs don't have to match exactly, but learning from implementation should be shared.)

[linear]

JS-1445