Add bootstrapped installation in Python for Windows (#1130)

A 1:1 port of the Bash script to Python for use on Windows.

Pulls some parts of #1068 but much more minimal. Avoids an additional
dependency on `requests`. Because we require `zstandard` to unzip the
distributions we unfortunately cannot be dependency free and cannot have
`bootstrap.sh` download the Python version needed to run this script
without it doing a non-trivial amount of work.

Retains the Bash script for now so you can bootstrap without Python
available. I may drop it in the future?

.github/workflows/ci.yml

@@ -80,16 +80,16 @@ jobs:
       - uses: actions/checkout@v4
       - name: "Install Rust toolchain"
         run: rustup component add clippy
-      - name: "Install Pythons"
+      - name: "Install Python for bootstrapping"
         uses: actions/setup-python@v4
         with:
-          python-version: |
-            3.7
-            3.8
-            3.9
-            3.10
-            3.11
-            3.12
+          python-version: 3.12
+      - name: "Install Python binaries"
+        run: |
+          pip install zstandard==0.22.0
+          python scripts/bootstrap/install.py
+          # ex) The path needs to be updated downstream
+          $env:Path = "$pwd\bin" + $env:Path
       - uses: rui314/setup-mold@v1
       - uses: Swatinem/rust-cache@v2
       - run: cargo clippy --workspace --all-targets --all-features --locked -- -D warnings