Matching by pattern with fallback

[larry-x-yu]

Summary of changes:

1. Added support of fallback to base URL: when the query strings don't match, it'll automatically fallback to the one w/o query string if one has been configured, e.g.:

this.server.get('/api/graphql', handlerA); fetch('/api/graphql?foo=none');
would fallback to handerA if no match for '?foo=none' found.

2. Added pattern matching: e.g.:

this.server.get('/api/graphql?foo=*&bar=*', handlerA); fetch('/api/graphql?foo=none&bar=123') would match handlerA.

3. Added test cases to verify the new features

Testing done:
All test cases passed

Major concerns:

1. Added a whole bunch code for supporting a simple pattern matching feature, is it overkill? - I used a Map for the matching as it helps in creating more meaning error messages down the road. Any suggestions is welcome!!!
2. With the fallback support, do you foresee any backward compatibility issues? The biggest concern is breaking some of our customers' existing test cases.

[hjdivad]

This looks great, thanks very much.

Two suggestions:

1. I have a couple of inline suggestions for you to consider
2. Can you please rebase the branch to have a clean commit history (probably this should be one commit, but either way I won't want to merge a commit history with an "Addressed review comment" commit as it makes git log and friends less useful.

Thanks very much!

[hjdivad]

Looks great, although i think you didn't intend to include 2b2f24f in the branch