Split same named SECTION but execute all at once

**Description**
I want to have a possibility to split a section to use common code between same named sections.

```
TEST_CASE("test") {

// Prepare.
int i = 0;

SECTION("A") { i = 1; }
SECTION("B") { i = 2; }

// Common code here.

SECTION("A") { i++; }
SECTION("B") { i--; }

CHECK(i == 2);

}
```

Both SECTIONs A should be executed on the same test case. Currently the first section A will be tested, later the other section A (same for section B).