add count command line flag

[h00die]

Description

This adds a new command line flag to print the count of modules (similar to the current banner) and exit. This prevents doing funky regex magic against the banner.

I wanted this feature to keep track of numbers for another project, and seemed like an easy win

Verification Steps

1. • ./msfconsole --count and see the counts

AI Usage Disclosure

GLM-5.2

[cgranleese-r7]

What would your thoughts be on renaming the flag to --module-count and maybe adding a shorthand flag to be aligned with the existing flags. Sorry to seem picky here, but I predict this be needed for future metadata work we have planned, potentially anyway 😄

Super knit picky, but would we want comma separated values here? Just thinking if they are being used programmatically, we may just want integers here?

Otherwise looks good to me 👍

❯ bundle exec ruby ./msfconsole --count
exploits: 2,677
auxiliary: 1,346
payloads: 2,599
post: 435
encoders: 57
nops: 14
evasion: 12

[h00die]

no problems from me, changed.