Don't require semicolon after macro usage with brackets

[aochagavia]

The following code expects a semicolon at the cursor position:

fn test() {
    println! {
        "Hello world"
    }<|>
    return;
}

This might be caused by the fact that the macro call is being treated as a non-block expression, though I don't know for sure (I am not very familiar with the parser):

https://github.com/rust-analyzer/rust-analyzer/blob/477de790b0211196256a772befe4f577d1a8ba14/crates/ra_syntax/src/grammar/expressions/mod.rs#L204-L209

The problem is that some macros should be treated as blocks and other shouldn't, so determining whether the element is a block based on SyntaxKind is insufficient in this case (unless we introduce a special syntax kind for block-like macro calls)

[matklad]

Note that similar logic already works for macros in item position:

https://github.com/rust-analyzer/rust-analyzer/blob/923483e321acace3bbf38688bd70d4d38f49b35e/crates/ra_syntax/src/grammar/items/mod.rs#L346-L350

this function basically returns "does this macro use {}". We need to apply the same logic in expressions.