Replace use of `scripts` with cross-platform `entry_points`

[bollwyvl]

Problem

In looking into #309, I see that scripts are being used. These are troublesome for cross-platform downstreams, as they make otherwise-well-behaved distributions less portable.

Proposal

Migrate from scripts to entry_points, where:

• the contents of scripts/gql-cli would be move to gql/cli.py
  • as main is already named there, might have a different name, e.g. entry_point_main
• setup.py would be updated, a la:

--- setup.py	2022-03-25 11:06:08.397539455 -0500
+++ setup.py	2022-03-25 11:08:23.321126291 -0500
@@ -8,7 +8,7 @@
 ]
 
 scripts = [
-    "scripts/gql-cli",
+    "gql-cli=gli.cli:main"
 ]
 
 tests_requires = [
@@ -106,5 +106,5 @@
     include_package_data=True,
     zip_safe=False,
     platforms="any",
-    scripts=scripts,
+    entry_points={"console_scripts": scripts}
 )

This would also allow the noarch python wheels to be created, which would be helpful for performance and security without increasing the maintenance/build burden much.

[bollwyvl]

Opened #311