Add type hints to all setup_*environment functions (#49985)

lib/spack/docs/build_systems/makefilepackage.rst

@@ -91,7 +91,7 @@ there are any other variables you need to set, you can do this in the
 
 .. code-block:: python
 
-   def setup_build_environment(self, env):
+   def setup_build_environment(self, env: EnvironmentModifications) -> None:
        env.set("PREFIX", prefix)
        env.set("BLASLIB", spec["blas"].libs.ld_flags)
 

lib/spack/docs/module_file_support.rst

@@ -128,7 +128,7 @@ depend on the spec:
 
 .. code-block:: python
 
-   def setup_run_environment(self, env):
+   def setup_run_environment(self, env: EnvironmentModifications) -> None:
        if self.spec.satisfies("+foo"):
            env.set("FOO", "bar")
 
@@ -142,7 +142,7 @@ For example, a simplified version of the ``python`` package could look like this
 
 .. code-block:: python
 
-   def setup_dependent_run_environment(self, env, dependent_spec):
+   def setup_dependent_run_environment(self, env: EnvironmentModifications, dependent_spec: Spec) -> None:
        if dependent_spec.package.extends(self.spec):
            env.prepend_path("PYTHONPATH", dependent_spec.prefix.lib.python)