Creating Dev Container for development of extension

[anthonykim1]

Creating Dev Container support for development of VSCode-Python extension on Codespaces, in which consists of:

• Creating Dockerfile with multiple supported versions of Python, Node.js installed
• Creating devcontainer.json that will point to the Docker file and relate to customization of necessary VSCode extension(s) customization
• Script(s) and prebuilds related materials

Note the base image in the Dockerfile will be the latest version of Fedora Linux instead of mcr.microsoft.com/devcontainers/python:3.7 (Debian) referenced in #20960.

After completion should be able to close: #20942 and #20960

---

Testing: #21435

Steps:

1. Open VS Code Python Repo via Codespaces from: https://github.com/microsoft/vscode-python
2. Check to see .venv appear as one of the directories on the file explorer.
3. Open a new instance of terminal, make sure it is the terminal with virtual environment activated (.venv)
4. run "npm run test:functional"
5. run "npm run test:unittests"
6. run "npm run test"

---

Expected output:

• Virtual environment is activated successfully after creating new instance of terminal as:

• Typing "python" on virtual environment activated terminal gives access to "Python 3.7.16"

• Typing "node" on virtual environment activated terminal gives access to "Node.js v16.17.1."

• Expected output for step 4: One test failing ("pyenvs common utils - finding Python executables
  mixed
  "before all" hook in "mixed":....)

• Expected output for step 5: Five tests failing (One from Interpreter Path Service and four tests from Activated Env Launch)

• Expected output for step 6: Failing with ("error while loading shared libraries: libnss3.so: cannot open shared object file: No such file or directory
  Exit code: 127
  End Standard tests (with errors) Failed")

[dbaeumer]

Actually the expected output looks different for me:

• first the steps should mention that you need to run npm run compile
• after step 4 I get:

  Python envs locator - WindowsPathEnvVarLocator
    iterEnvs()
     no executables found
     no executables match
     some executables match


  120 passing (21s)
  21 pending

@anthonykim1 please decide whether this is still OK or not.