Add Sentry logs

[cleptric]

This adds initial support for logs in the PHP SDK.

use function Sentry\logger;

logger()->info('Hello, %!', ['PHP'], ['an_attribute' => 42]);
logger()->flush();

ToDos:

See: https://develop.sentry.dev/sdk/telemetry/logs/

• Create a proper attributes API
• Support for string templates
• Support for extra attributes
• Support usage with the agent
• Add beforeSendLog
• Log any logger() calls to the configured logger. (aka, debug: true).
• Add a default server.address attribute to each log entry
• Tests

[stayallive]

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