feat: Allow initializing manually and shutting down SentrySDK

[limbonaut]

This PR adds new lifecycle methods to the SentrySDK class: init(), close(), and is_enabled(). These methods are similar to what you’ll find in other SDKs. By default, the SDK tries to initialize itself automatically if "Auto Init" is enabled in the project settings. If disabled, devs can still manually initialize the SDK by calling init(). close() allows shutting down the previously initialized SDK.

• Resolves Add manual initialization and shutdown #257

This makes configuration script approach obsolete, giving us two clear options:

1. Auto-initialization (performed early).
2. Manual initialization with an optional configuration callback (like the lambda in the example below).

Additionally, options.enabled is renamed to auto_init for better clarity, as suggested by @bruno-garcia here.

Check #257 (comment) for more details.

Breaking changes

• Configuration script option and class are removed and no longer supported. Instead, please use manual initialization with configuration callback (see below).
• enabled option is renamed to auto_init for clarity, and removed from SentryOptions properties (setting it from code has no sense - we auto-initialize very early).
• disabled_in_editor_play option is renamed to skip_auto_init_on_editor_play for clarity, and removed from SentryOptions properties.

How to initialize and configure the SDK from code

The earliest you can initialize the SDK is in the MainLoop._initialize(). Here's how you can do it:

1. Disable "Auto Init" in the project settings under Sentry category.
2. Create a main loop script with a class_name attribute, and init Sentry inside _initialize() method.

class_name MyMainLoop
extends SceneTree

func _initialize() -> void:
	# Sentry initialization
	SentrySDK.init(func(options: SentryOptions) -> void:
		options.release = "[email protected]"
	)
	
	# Post-init configuration
	SentrySDK.add_attachment(...)
	# ...

3. Assign your main loop type in the project settings under application/run/main_loop_type ("MyMainLoop" in the example code).

[github-actions]

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[limbonaut]

@sentry review

[jpnurmi]

I like how the tests are somehow easier to understand at a glance because the SentrySDK.init() call is visible. LGTM 👍