[LA] Implement Logging APIs in the SDKs

[AbhiPrasad]

Description

Sentry is working on an application logging product. See more details in the PRFAQ: https://www.notion.so/sentry/PRFAQ-Application-Logging-1258b10e4b5d80ea8e98e8ec5505542c

Given this is a new signal that sentry ingests, we need to update the SDKs to send logs to Sentry. The goals of this project are the following:

1. Define the unified public API for sending logs via a Sentry SDK
2. Define internal SDK behaviour for capturing, processing, and sending logs
3. Add support for the JavaScript SDK, Python SDK, and a single Mobile SDK for the initial alpha

This means at the end we'll have new develop docs for describing the logs envelope and logs API, and support in 3 SDKs.

Once the above have been done, we'll close this project, and open a new one for all the SDK functionality we'll add for GA.

Slack-Channel

#proj-structured-logs

Notion Document(s)

Notion Spec: https://www.notion.so/sentry/Logs-in-the-SDK-1a48b10e4b5d80b1827fe14d9fd0236b#1a48b10e4b5d80a782a9efc6fd463acf

Stakeholder(s)

@Dhrumil-Sentry
@AbhiPrasad

Team(s)

Mobile, Web Backend, Web Frontend

SDKs

Team Web Frontend SDKs

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1. JavaScript SDK
2. Electron SDK

Team Web Backend SDKs

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1. Python SDK

Team Mobile SDKs

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1. Android SDK
2. Apple/Cocoa SDK
3. React Native SDK
4. Dart/Flutter SDK