Describe the bug
It seems go-zero doesn't support case-insensitive route. E.g. If I have a path as /subscription/:id/group/name, then I expect it also works fine with an input /subscription/id/Group/Name. However, go-zero directly returns 404 page not found error. I know Linux system is case-sensitive, however, for endusers, they don't care about upper case or lower case. This will directly impact user experience.

To Reproduce
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1. The code is

2. The error is

Expected behavior
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Screenshots
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Environments (please complete the following information):

• OS: [e.g. Linux]
• go-zero version [e.g. 1.2.1]
• goctl version [e.g. 1.2.1, optional]

More description
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