Add option to select tree-sitter statements

[atxr]

Currently, tree-sitter statements are hardcoded in the scrings lib
See here for python

It could be very useful to be able to set it manually, by adding or removing some statements depending on the current analysis.
Indeed, during a scan, it can happen that a statement is very noisy, or on the contrary that the output is not noisy enough.

On the cli, it could be two flags like --exclude-statement and --include-statement:

scrings -p to_scan.raw -l python --exclude-statement import_statement --include-statement slice