[Backend] Package install functionality (python only)

[Soap2G]

Whenever a record presents a python package available, add an install button next to the file.

The action of clicking achieves the following:

• Spawns a terminal in the background and pip install <link-to-the-.zip-file>.
• Includes either:
  • a progress bar for the installation.
  • the output of the terminal with the progress of the installation.

[garciagenrique]

I will vote for the option of the output of the terminal with the progress of the installation (and the typical output when you do a pip install indicating what has been installed and which version).