Issue 1314 | Client: get function by name

[IceKhan13]

Summary

Get function by name using client

client = ServerlessClient(...)

my_function = client.get("my-function")
# <QiskitFunction "my-function">

job = my_function.run()

Details and comments

List programs got feature to filter by title field. So, get client method is reusing this endpoint. It already had all access policies, so it make code changes pretty neat. And also it avoids problems with unique migrations, etc.

Closes #1314

[akihikokuroda]

LGTM Thanks!

[Tansito]

LGTM, I didn't update the issue with the changes in #1331 so my fault here. An improvement that we can do in the next version (I'm fine with this approach by now) is to update the interface to guarantee the uniqueness of the function using the new provider interface:

my_function = client.get("my-function")
# this get will look for this title in your private functions (author query)

my_function = client.get("provider/my-function")
# or
my_function = client.get(title="my-function", provider="provider")
# this get will look for this title in the provider

This way we can guarantee the uniqueness of the get method.