[Enhancement] Support debug print output for the playground

[andrzejgorski]

Bug Report

Please answer these questions before submitting your issue. Thanks!

1. Minimal reproduce step (Required)

Go to https://play.kcl-lang.io/ and chose Conditionals from examples

2. What did you expect to see? (Required)

Working code:

if True:
    "Hello"
else:
   "unreachable"

with output

"Hello"

https://play.kcl-lang.io/?s=JYMwBAKgTgrgpgLgFBlWARACTgGxwe3SVwGdEU10YA7KOAQwGMALegIxziKA

3. What did you see instead (Required)

if True:
    print("Hello")
else:
    print("unreachable")

With output

{}

https://play.kcl-lang.io/?s=JYMwBAKgTgrgpgLgFBlWADlYA7ALgCgCIAJOAGzIHtCBKJcgZ0RTUxwMJmyjgEMBjABa8ARmTi0kQA

4. What is your KCL components version? (Required)

play.kcl-lang.io

[andrzejgorski]

The similar problem is with Debugging Values example