This commit fixes `test_global_parap_err_first` test in
[test_syntax.py](https://github.com/RustPython/RustPython/blob/master/Lib/test/test_syntax.py#L678) and implement the other syntax errors detection as cpython 3.8 provided for global symbol.

Below syntax error conditions are added.
* name {} is parameter and global
```python
>>>>> def test(a):
.....   global a
.....
SyntaxError: name 'a' is parameter and global at line 2 column 2
        global a
```
* annotated name {} can't be global
```python
>>>>> def test():
.....   a: int
.....   global a
.....
SyntaxError: annotated name 'a' can't be global at line 3 column 2
        global a
```
* name {} is assigned to before global description
```python
>>>>> a = 100
>>>>> def test():
.....   a = 10
.....   global a
.....
SyntaxError: name 'a' is assigned to before global declaration at line 3 column 2
        global a
```
* name {} is used prior to global declaration
```python
>>>>> a = 10
>>>>> def test():
.....   print(a)
.....   global a
.....
SyntaxError: name 'a' is used prior to global declaration at line 3 column 2
        global a
```

Signed-off-by: snowapril <sinjihng@gmail.com>

add `!symbol.is_global()` condition check before entrying global symbol
errors

This change will decrease hot path cost.

Signed-off-by: snowapril <sinjihng@gmail.com>