[I] feat: Add the possibility to manipulate query parameters / search string using proxy-rewrite plugin [apisix]

[via GitHub]

markokocic opened a new issue, #11237:
URL: https://github.com/apache/apisix/issues/11237

   ### Description
   
   `proxy-rewrite` plugin has a possibility to add / remove / set headers to 
the request. It would be nice if it were possible to add / remove / set url 
query parameters.
   
   For example, let's say we get a request with the following uri:  
`/path?param1=1&param2=this&param3=that` and want to overwrite param1, remove 
param2, and add param4 before sending the request to the upstream. If 
`proxy-rewrite` would have the same options for query params as for headers, we 
could configure it somethign like this:
   
   ```json
    "proxy-rewrite": {
       "uri": "/test/home.html",
       "host": "iresty.com",
       "query-params": {
          "set": {
               "param1": "etwas"
           },
           "add": {
               "param4": "(id=32&name=\"test*\")&age<32",
               "param4" : "it's valid to have more params with the same name"
           },
           "remove":[
               "param2"
           ]
       }
   ```
   Plugin should take care that complete search sting is properly escaped and 
encoded. This would come very handy when dealing with ODATA services on the 
backend that use query-params intensively.
   
   Alternative: theoretically it is possible to manipulate the whole uri, 
including the search string, using `regex_uri`, but in the case of multiple 
parameters that regex can quickly grow very wild and unreliable.


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