install_requires in assemble_pip not aggregated from dependencies

[Marcus-Rosti]

install_requires should be aggregated from the dependencies of the various build targets

oad("@rules_python//python:defs.bzl", "py_library")
load("@global-python-deps//:requirements.bzl", "requirement")
load("@graknlabs_build_tools//pip:rules.bzl", "assemble_pip")

package(default_visibility = ["//visibility:public"])

py_library(
    name = "example",
    srcs = [
        "__init__.py",
        "example.py",
    ],
    deps = [
                  requirement("numpy"),
    ],
)


assemble_pip(
    name = "example-pip",
    target = "//example:example",
    package_name = "example",
...
    install_requires = [ (all of the transitive deps from //example:example et al. )] 
)