add aliases to run vendored python and node from command line

You can then do './scripts/python -m venv /path/to/venv' to create
a virtual env based on the bundled Python, which can be handy if
you don't happen to have the appropriate version of Python installed
separately.

python/BUILD.bazel

@@ -2,6 +2,15 @@ load("@rules_python//python:defs.bzl", "py_binary")
 load("@py_deps//:requirements.bzl", "requirement")
 load(":binary.bzl", "pip_binary")
 
+# e.g. bazel run python
+alias(
+    name = "python",
+    actual = "@python//:python",
+)
+
+# e.g. bazel run python:pip
+pip_binary(name = "pip")
+
 pip_binary(name = "black")
 
 pip_binary(name = "isort")

scripts/python

@@ -0,0 +1,3 @@
+#!/bin/bash
+
+bazel run python -- $*

ts/BUILD.bazel

@@ -29,3 +29,8 @@ alias(
     name = "yarn",
     actual = "@nodejs//:yarn",
 )
+
+alias(
+    name = "node",
+    actual = "@nodejs//:node",
+)