[phpcs] Add sniffs for function declaration and -calls
[phpcs] Add sniffs for function declaration and -calls

When declaring a function
- Do not add a space before a comma
- Add a space after a comma
- Add a space after an equal sign

Example:
function myFunction($x, $y, $z = null){...}

When calling a function
- Do not add a space before the opening parenthesis
- Do not add a space after the opening parenthesis
- Do not add a space before the closing parenthesis
- Do not add a space before a comma
- Add a space after a comma

Example:
myFunction('x', 'y', 'z');

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