[Ballerina Shell] External library support not tested

[kdsuneraavinash]

Description:
Even though it is possible to run Ballerina shell against external libraries, this is not fully tested. Some issues, especially relating to types that are not visible outside the library, may occur. Also, some test cases should be added to test this functionality.

Steps to reproduce:
In REPL,

=$ import abc/pqr
 // If pqr:call() returns a value of which the type is not public, following will fail.
=$ var r = pqr:call()

[anupama-pathirage]

We are closing this issue due to inactivity. If you need further assistance or have additional input, feel free to reopen it. Thank you for helping us maintain a relevant and focused issue list!