Make LocationData.accuracy and LocationData.time non-nullable

[matasb-google]

This PR makes LocationData.accuracy and LocationData.time non-nullable (double instead of double?).

Every platform implementation now consistently provides both values:

• Android: Always provides both (via Location.getAccuracy() and Location.getTime()).
• iOS/macOS: Always provides both (via CLLocation.horizontalAccuracy and CLLocation.timestamp).
• Web: Always provides both (via GeolocationCoordinates.accuracy and GeolocationPosition.timestamp).
• Windows: Always provides both (via Geocoordinate.Accuracy and Geocoordinate.Timestamp).
• Linux: Updated in this PR to populate time (derived from GeoClue2 Timestamp property). Previously, time was omitted on Linux (resulting in null in Dart).

As a result, accuracy and time are now guaranteed to be present in LocationData.

💥 Breaking Change

This is a breaking change for:

• Users of LocationData.fromMap or LocationData.fromJson who omit accuracy or time in the map/json.
• Test doubles/mocks that construct LocationData without these fields.

All package tests have been updated to include these fields in mock data.

[Copilot]

Pull request overview

This PR updates the LocationData model in location_platform_interface to guarantee accuracy and time are always present (non-nullable), aligning behavior across platform implementations and updating Linux to populate time from GeoClue2.

Changes:

• Make LocationData.accuracy and LocationData.time non-nullable and update their parsing/docs in LocationData.fromMap / fromJson.
• Update Linux implementation to map GeoClue2 Timestamp into time (ms since epoch).
• Update package tests to include accuracy and time in mocked LocationData inputs.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
packages/location/test/location_test.dart	Updates mock LocationData.fromMap inputs to include required accuracy and time.
packages/location/linux/location_plugin.cc	Populates time from GeoClue2 Timestamp (seconds + microseconds → ms).
packages/location_platform_interface/test/types_test.dart	Updates LocationData serialization/parsing tests to include accuracy and time.
packages/location_platform_interface/test/method_channel_location_test.dart	Updates method-channel test stubs/stream events to include required accuracy and time.
packages/location_platform_interface/lib/src/types.dart	Makes accuracy/time non-nullable in LocationData and updates JSON/map parsing and docs.

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