feat: support pasv mode port mapping

[KirCute]

Modify the type of PassiveTransferPortRange in the driver settings to the interface PasvPortGetter, which is essentially a function that can return the exposed port and the listened port. The listened port will be listened by the local host, while the exposed port will be returned as the result of the PASV or EPSV command. This design ensures that the library can adapt to cases where port mapping exists between the client and server, such as deployment within Docker.

PortRange implemented PasvPortGetter, so the modified version will remain compatible with previous versions.

[fclairamb]

I like how you implemented it !

[codecov]

Codecov Report

Attention: Patch coverage is 64.28571% with 10 lines in your changes missing coverage. Please review.

Project coverage is 86.54%. Comparing base (6e2547d) to head (136f60a).

Files with missing lines	Patch %	Lines
driver.go	50.00%	5 Missing ⚠️
transfer_pasv.go	72.22%	4 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #521      +/-   ##
==========================================
- Coverage   86.68%   86.54%   -0.14%     
==========================================
  Files          11       12       +1     
  Lines        2328     2342      +14     
==========================================
+ Hits         2018     2027       +9     
- Misses        236      240       +4     
- Partials       74       75       +1     

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[fclairamb]

Hum, reducing coverage is not cool.