MINOR: [Go] Add "IsSignedInteger" (#35050)

### Rationale for this change
Return true, if data type is signed integer(int8, int16, int32, int64).

### What changes are included in this PR?
Implementation "IsSignedInteger"

### Are these changes tested?
No

### Are there any user-facing changes?
Yes

Authored-by: izveigor <izveigor@gmail.com>
Signed-off-by: Matt Topol <zotthewizard@gmail.com>

Author: izveigor

go/arrow/datatype.go

@@ -286,6 +286,16 @@ func IsUnsignedInteger(t Type) bool {
 	return false
 }
 
+// IsSignedInteger is a helper that returns true if the type ID provided is
+// one of the int integral types (int8, int16, int32, int64)
+func IsSignedInteger(t Type) bool {
+	switch t {
+	case INT8, INT16, INT32, INT64:
+		return true
+	}
+	return false
+}
+
 // IsFloating is a helper that returns true if the type ID provided is
 // one of Float16, Float32, or Float64
 func IsFloating(t Type) bool {