feat: update webpack configure and support js file integrate

[zhu-xiaowei]

Description

1. update webpack configure and support js file integrate.
2. fix the issue for window.document is null when integrate by js file.

General Checklist

• [x] Added new tests to cover change, if needed
• [ ] Security oriented best practices and standards are followed (e.g. using input sanitization, principle of least privilege, etc)
• [x] Documentation update for the change if required
• [x] PR title conforms to conventional commit style
• [ ] If breaking change, documentation/changelog update with migration instructions

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

Patch coverage: 100.00% and no project coverage change.

Comparison is base (821918c) 100.00% compared to head (c4e9fdc) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #15 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 24 24 Lines 953 964 +11 Branches 172 176 +4 ========================================= + Hits 953 964 +11 ``` | [Files Changed](https://app.codecov.io/gh/awslabs/clickstream-web/pull/15?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=awslabs) | Coverage Δ | | |---|---|---| | [src/tracker/ClickTracker.ts](https://app.codecov.io/gh/awslabs/clickstream-web/pull/15?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=awslabs#diff-c3JjL3RyYWNrZXIvQ2xpY2tUcmFja2VyLnRz) | `100.00% <100.00%> (ø)` | |

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