Feature: Allow picking the port used for connecting to SMB share

### What feature or improvement do you think would benefit Files?

ISP sometimes blocks standard Samba port (445) so some servers now use a different port.

However Files does not seem to support specifying the port: would be great if it was possible to type:

> \\\server:port\share

### Requirements

- Files should allow browsing/adding a server with a custom port: `\\server:port\share`

### Files Version

3.2.0.0

### Windows Version

10.0.19045.4598

### Comments

_No response_

Begin by tracing how Files parses SMB paths and establishes share connections, then identify where the standard port is assumed. Verify the requested \\server:port\share form works for browsing and adding a server, while existing standard-port paths continue to work.

Written by the indexing model from the issue text.