[FEATURE] Currency Script | Add search functionality for currencies

[sue-lim]

Users may not know exact currency codes. Searching by name would improve UX.

Describe the solution you'd like
In currencies.py, add a function to:

Search currency list by name or partial match
Return matches in a readable format
Describe alternatives
Showing full list only, which is overwhelming.

Additional context
Search could be CLI-based or extended to a GUI later.

[sue-lim]

@DhanushNehru - please kindly assign this issue to me.
Many thanks