MANIFEST/setup: Use setup.py & new MANIFEST.in to minimize package size.

Previously setup.py specifically excluded tests from being packaged, but
recent testing demonstrated this now included other files, including
development tools.

Moving to use the `include` option for the source is simpler here,
combined with the addition of a MANIFEST.in file.

The MANIFEST.in file is used by various tools, and appears more reliable
than other methods to achieve this, particularly as we move towards
using pyproject.toml.

For now, this aims to remove all but the absolute minimum files to run.

MANIFEST added to .gitlint to allow presence as an area in commit
titles.

Author: neiljp

.gitlint

@@ -32,7 +32,7 @@ line-length=76
 
 [area-formatting]
 # This is a ZT custom rule; these are excluded from the lower-case area rule
-exclusions=WIP, DEBUG, README, CHANGELOG, LICENSE, FAQ
+exclusions=WIP, DEBUG, README, CHANGELOG, LICENSE, FAQ, MANIFEST
 
 [ignore-by-title]
 # Ignore all rules for commits of which the title matches below

MANIFEST.in

@@ -0,0 +1,11 @@
+prune tools
+prune tests
+prune .github
+exclude .git*
+exclude makefile
+exclude Pipfile
+exclude .codecov.yml
+exclude .mailmap
+# May bring these back, but aiming to reproduce previous minimal sdist first
+prune docs
+prune docker

setup.py

@@ -87,7 +87,7 @@ def long_description():
     },
     python_requires=">=3.7, <3.12",
     keywords="",
-    packages=find_packages(exclude=["tests", "tests.*"]),
+    packages=find_packages(include=["zulipterminal*"]),
     zip_safe=True,
     entry_points={
         "console_scripts": [