[Feature]: Support OPTIONS method request for server on ModernJs

[thuutri2710]

What problem does this feature solve?

This helps us to be able handle the OPTIONS (method) request. When customizing server on ModernJs, I want to expose some APIs. Because these APIs are called on a different domain so browsers will send the OPTIONS request automatically. However, currently, ModernJs server can't catch the OPTIONS request so it throws the CORS error.

What does the proposed API look like?

In the file packages/server/core/src/serverBase.ts.

I expect we can add the getter for options. Because it's duplicated with the name of property options, so I suggest that we'll use serverOptions for that property and have method getOptions to get its value

[zllkjc]

Let me try this issue~