Suppress by error code

[koto]

Extracted from microsoft/vscode#108682:

@jrieken: Would it be possible to teach tsec more than one error code and to able to suppress certain error codes (instead of files)?

The use case Johannes outlined in vscode is their usage of dynamic imports - there's nothing actionable for the projects to move off them, but tsec should be able to surface violations of a different kind in the files.

[uraj]

Maybe we can support wildcards in the exemption list, so that we can have something like

{
    "ban-dynamic-imports": ["**/*.ts"]
}