refactor: move __version__ and __version_info__ into _version.py

[chaoming0625]

Extract the version definitions from brainpy/__init__.py into a dedicated brainpy/_version.py module and re-export them from the package root.

• brainpy._version is now the single source of truth for the version string.
• brainpy/__init__.py re-exports __version__ and __version_info__, so pyproject's version = { attr = "brainpy.__version__" } still resolves.
• _version.py is already listed in the coverage omit lists in pyproject.toml.

Verified import brainpy yields 2.8.0 / (2, 8, 0).

Summary by Sourcery

Enhancements:

• Introduce brainpy._version as the single source of truth for version and version_info and re-export these attributes from brainpy.init.py.

[sourcery-ai]

Reviewer's Guide

Refactors version handling by moving the package version definitions into a dedicated brainpy._version module and re-exporting them from brainpy.init to keep existing public APIs and packaging configuration working.

File-Level Changes

Change	Details	Files
Centralize version constants in a dedicated _version module while preserving the public API.	Removed inline version and version_info definitions from the package init file. Added imports in the package init to re-export version and version_info from the new _version module. Created a new _version module containing the version string and derived version_info tuple, with standard project license header.	brainpy/__init__.py brainpy/_version.py

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[sourcery-ai]

Hey - I've left some high level feedback:

• Consider using a relative import (from ._version import __version__, __version_info__) in __init__.py to avoid potential issues if the package is ever renamed or vendored.

Prompt for AI Agents

Please address the comments from this code review:

## Overall Comments
- Consider using a relative import (`from ._version import __version__, __version_info__`) in `__init__.py` to avoid potential issues if the package is ever renamed or vendored.

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