feat(package): /p/demo/mux support query strings

[thinhnx-var]

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• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
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• Added new benchmarks to generated graphs, if any. More info here.

This PR aims to support mux package for querying with strings. (relates #2585 )

Usage:

request.Query(): Get  map of keys and list of values from params
request.Query()["key"]: Get list of values corresponding to the key
request.Query().Get("key"): Get the very first value of the key.

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[thinhnx-var]

I am thinking about if we want to use avl tree to store the params instead of using map

[ajnavarro]

@moul @zivkovicmilos can you have a look into this? Thanks.

[moul]

i think that you're not supporting having a slash in one of the query parameters:

gno.land/p/demo/foo?a=b&c=d/e

[thinhnx-var]

yeah, I saw your TODO in current request parser. I will try to update for this /a/b/c/d/... case.

[moul]

you're just adding new helpers, but the underlying existing library won't work with the changes, please add more unit tests for the existing helpers with query strings.

like hello/{name} with hello/Alice?a=b -> currently name equals Alice?a=b instead of Alice.

[thinhnx-var]

you're just adding new helpers, but the underlying existing library won't work with the changes, please add more unit tests for the existing helpers with query strings.

like hello/{name} with hello/Alice?a=b -> currently name equals Alice?a=b instead of Alice.

@moul
I have just updated the PR. I am not sure but I think these changes are now working with underlying existing library ( tests are added in Render() test. Can you give a look on this PR when you have a chance?

[leohhhn]

@thinhnx-var

What is the state of this PR?

[thinhnx-var]

@leohhhn
I did not see any reviews from my last commit and fixes. Let me try updating latest version.