Support dynamic arguments: http sampler might need variable number of arguments depending on the previous steps

### Use case

Http call: `/api/delete?param1=1¶m2=2¶m3=3......`

In other words, the use case is like "here's a set of name-value pairs, pass them as parameters".

See also:
* https://github.com/apache/jmeter/issues/4750

### Possible solution

Currently, JMeter allows using `${...}` functions and expressions for both param names and values, however, there's no way to "add/remove" parameter rows with expressions.
We might either implement a separate field for "parameter array", or something like that.

Of course, users might attempt modifying the sampler with JSR223 preprocessor, however, I think we should refrain from the design where users treat TestElements as mutable in the runtime.
Ideally, we should treat TestElements as immutable, so we could reuse the same elements across threads, so we save on heap.

### Possible workarounds

A workaround might be building the path string with JSR223

### JMeter Version

5.5

### Java Version

_No response_

### OS Version

_No response_