Updates to package:hive_flutter

[baumths]

Closes #691 exporting Color and TimeOfDay adapters:

• The adapters are being exporter from a different file adapters.dart to avoid naming conflicts for users that define their own Color & TimeOfDay adapters.
• import 'package:hive_flutter/adapters.dart';

Improves pub score by conditionally importing packages that depend on dart:io (path & path_provider).

• Adds tag Web to the package at pub.dev.

Tried fixing #688 for null safety badge on pub.dev

flutter pub global run pana outputs error:

✗ Support sound null safety (0 / 20)
[x] 0/20 points: Null safety support has one or more issues

Tag detection failed.

Broken import dart:indexed_db

For more information

Try running dart pub outdated --mode=null-safety.
Be sure to read the migration guide.

• See: Allow using dart:indexed_db in flutter apps flutter/flutter#44937.
• flutter pub outdated --mode=null-safety outputs:

  Showing dependencies that are currently not opted in to null-safety.
  [✗] indicates versions without null safety support.
  [✓] indicates versions opting in to null safety.

  All your dependencies declare support for null-safety.

@themisir feel free to request changes.

[themisir]

LGTM

[baumths]

@themisir I have fixed the TimeAdapter issue, have a look now (had to fix the tests too) now I think it is good to go.

[themisir]

What do you think about that?

[baumths]

@themisir done.