Support ATOMIC Functions

[gitrojones]

Bug report

Describe the bug

Trying to run against an atomic function definition results in unexpected syntax errors:

To Reproduce

Create a sql file with an atomic function definition and run the linter against it. postgrstools check <file>

Expected behavior

It should treat an atomic function body as valid syntax

System information

• Postgrestools v0.15.0

[psteinroe]

thanks for reporting! pr with the fix is up :)