server$ function arguments can now be taken from query params

[Tommypop2]

Allows for server$ functions to receive arguments through the query params of a GET request. This allows for server$ functions to be used to generate assets such as dynamic images, where args could be sent via get params in the img tag's src url to influence the final image.

PR Type

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update (formatting, local variables)
• Refactoring (no functional changes, no api changes)
• Build related changes
• CI related changes
• Documentation content changes
• infrastructure changes
• Other... Please describe:

What is the current behavior?

Currently, server$ functions called through a GET request to their URL are given no arguments

What is the new behavior?

An args query param is used to pass arguments to server$ functions as a last resort.
For example, the following function, when accessed through <server_function_url>?args=[1,2]), would produce the result "3":

const data = server$((var1, var2) => {
	return (var1 + var2).toString();
});