fix: avoid access document or window in server side

[kingyue737]

Description

X6在多处module scope中直接访问了document、window等仅在client端可用的变量，导致一旦import '@antv/X6'服务端渲染就会出错（根据README，X6本应该支持服务端渲染）

X6/README.md

Line 32 in f2cae96

- 支持服务端渲染。

本PR将document等移至函数中，或加上条件保护，使代码在server端也能正常运行。

Motivation and Context

fix #4095

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)
• Enhancement (changes that improvement of current feature or performance)
• Refactoring (changes that neither fixes a bug nor adds a feature)
• Test Case (changes that add missing tests or correct existing tests)
• Code style optimization (changes that do not affect the meaning of the code)
• Docs (changes that only update documentation)
• Chore (changes that don't modify src or test files)

Self Check before Merge

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.