pkg_resources patch issue

[tbartley94]

Describe the bug

Reposting from @dan-ukr

 While executing imports with the newest Nemo and all the dependencies, there is an issue         ModuleNotFoundError: No module named 'pkg_resources' - due to the fact the the newest Nemo requiers the newest setuptools, where pkg_resources were removed, however lightning still requires them. My fix was:

def patch_pkg_resources():
    if 'pkg_resources' in sys.modules: return
    pkg_res = types.ModuleType("pkg_resources")
    pkg_res.declare_namespace = lambda name: None
    class Requirement:
        def init(self, req_str): self.req_str = req_str
        def repr(self): return self.req_str
    class Distribution:
        def init(self, name):
            self.project_name = name
            try: self.version = metadata.version(name)
            except: self.version = "0.0.0"
        def repr(self): return f"{self.project_name}=={self.version}"
        def as_requirement(self): return Requirement(self.project_name)
    pkg_res.get_distribution = lambda dist: Distribution(dist)
    pkg_res.Requirement = Requirement
    pkg_res.Distribution = Distribution
    pkg_res.working_set = [Distribution("nemo_toolkit"), Distribution("lhotse")]
    sys.modules["pkg_resources"] = pkg_res patch_pkg_resources()

    So, basically 'find pkg_resources anywhere locally and run it' - worked in my env