OpEx: more reports for 2025 Congressional Budget Justification

[jimlerza]

Added 3 more CBJ reports:

• All petitions filed by non-attorney practitioners (not pro-se petitioners) in a given (fiscal or calendar) year.
• All attorney practitioners admitted in a given (fiscal or calendar) year.
• Statistics for Limited Entry of Appearance documents and their companion Notice of Completion documents.

[jimlerza]

Rather than hard-code the P event code in the documents-filed-by-non-attorneys script, I made an eventCode parameter that can be passed in so we can re-use the report for other document types.

[Mwindo]

I didn't dive too deep into this, but it looks reasonable. Thanks @jimlerza!