Add support for Toolchain Download

[imbev]

Describe the bug Rye project creation ignores base interpreter setting

To Reproduce Steps to reproduce the behavior:

1. Install Python 3.10
2. Open New Project Wizard
3. Set Environment to Rye
4. Set Base Interpreter to python3.10
5. See venv created with Python 3.11

Expected behavior Rye creates venv with Python 3.10

Environments (please complete the following information):

• IDE: PyCharm Community 2023.1
• OS: Fedora Linux 37 (Container Image) running in Distrobox under Fedora Kinoite 37
• Plugin version: Commit 700ba69

Additional context I suggest consideration on how this plugin should handle Rye's toolchain situation. I think it would be beneficial to have support for choosing a base interpreter, as well as support for choosing a particular version for Rye to pin and download.

Funding

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[koxudaxi]

@imbev I found a way to list downloadable toolchains. https://github.com/mitsuhiko/rye/pull/52

I will use the list for the feature.

[imbev]

Idea's Download JDK menu might be a good model for an interface for Rye toolchain.

[linux-china]

@imbev I found a way to list downloadable toolchains. mitsuhiko/rye#52

I will use the list for the feature.

This feature is very useful, thanks :)