refactor!: Un-export Timer

[ufrshubham]

Description

This PR removes the internal Timer class from the exports. It is a very simple wrapper over the Stopwatch API and does not provide any additional functionality. But it does causes conflicts when try to use Flame's Timer or dart:async's Timer. By not exporting it, we can save the users from these conflicts.

Checklist

• The title of my PR starts with a Conventional Commit prefix (fix:, feat:, docs: etc).
• I have read the Contributor Guide and followed the process outlined for submitting PRs.
• I have updated/added tests for ALL new/updated/fixed functionality.
• I have updated/added relevant documentation in docs and added dartdoc comments with ///.
• I have updated/added relevant examples in examples.

Breaking Change

• Yes, this is a breaking change.
• No, this is not a breaking change.

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