feat(example): query module

[louonezime]

This PR introduces a new query package that provides reusable helpers for working with URL query strings. It is designed to simplify parsing, updating, and reconstructing query parameters in a clean and generic way.

This logic was originally embedded in the blog package (in #4324), but has now been extracted into its own utility package to promote reusability and separation of concerns.

• ParseQueryParams(key, rawURL) → get a single query parameter value
• ParseQueryMap(rawURL) → return all query parameters as a map[string]string
• UpdateQuery(rawURL, key, value) → set or overwrite a single query param
• UpdateQueryMulti(rawURL, map[string]string) → update multiple query params at once
• DeleteQuery(rawURL, key) → remove a parameter from the query string

UPDATE

• GetQueryValues – Get all values for a given key.
• GetQueryFirstValue – Get the first value for a given key.
• HasQueryKey – Check if a key exists in the query.
• GetQueryValueFromURL – Retrieve a query value from a raw URL.
• ParseQueryFirstValuesMap – Parse a URL into a map of first values.
• UpdateQueryValue – Set a single value for a key.
• UpdateQueryValues – Set multiple values for a single key.
• UpdateQueryFirstValues – Set single values for multiple keys.
• UpdateQueryAllValues – Set multiple values for multiple keys.
• SetQueries – Replace or add keys with single values.
• SetQueriesMulti – Replace or add keys with multiple values.
• DeleteQuery – Remove a specific key from the query.
• ResetQuery – Remove all query parameters from the URL.

[Gno2D2]

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[notJoon]

Could you check the action failures? Thank you

Seems like the CI failures dose not related with this PR. ignore this comment

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[notJoon]

I left some suggestions, but implemtation looks good 👍

[notJoon]

LGTM 👍

remove: review/triage-pending flag

[leohhhn]

would've been good to mention that is it specifically for queries, ie after ?. we've three possible things in the URL:

pkgpath:renderpath{?queries , $gnowebparams}