tools: add output when scanning module in an install query

[ttytm]

Since more validation logic is moved out of the final install and update process, it can take longer for a user to get an initial feedback from vpm - it's not an instant Installing ... anymore, because the validation is done beforehand. Also, there are cases that don't reach the Installing <moname> print already. This PR adds Scanning <modname> print when parsing and validating the install-query to give a user a quicker feedback that the request is being processed and at what state it is.

For now, I would continue to keep the outputs simple. After most of the teething problems are fixed, I'm planning to propose color-coded outputs for VPM - probably similar cargo, but we can then discuss on Discord which style is appropriate for V.

🤖[deprecated] Generated by Copilot at 1dc786e

Improve vpm output by showing scan progress for module identifiers. Add a print statement to cmd/tools/vpm/common.v.

🤖[deprecated] Generated by Copilot at 1dc786e

• Add a scan_module_identifier function to parse a module identifier from a string and return a struct with the name, version, and source (link, F0