Added CI script, updated dependencies, and fixed bugs

-Added CI yaml file for workflows
-Added `doctest` as dependency
-Added test target executable to CMakeLists.txt
-Renamed `bin` scripts to remove `gdpm*` prefix
-Updated `SQLite 3` dependency in CMakeLists.txt
-Implement basic unit testing in `tests/basic.cpp`
-Fixed issue with handling `fmt` strings

bin/gdpm-test.sh

@@ -1,36 +0,0 @@
-command=build/gdpm
-
-# Install packages using install command and specifying each package name or file
-${command} install "ResolutionManagerPlugin" "godot-hmac"
-${command} install -f packages.txt --clean --godot-version 3.4
-
-# Remove packages using remove command and specifying each package name or file
-${command} remove "ResolutionManagerPlugin" "godot-hmac" -y
-${command} remove -f packages.txt -y
-
-# Manually synchronize the local database with remote servers
-${command} sync
-
-# Search for packages containing "Godot" in package name
-${command} search "Godot" --config config.json
-${command} search "Godot" --no-sync --godot-version 3.4 --max-results 20 --sort updated
-
-# List all currently installed packages
-${command} list
-${command} list packages
-${command} list remote-sources
-
-${command} add-remote https://godotengine.org/asset-library/api
-${command} delete-remote https://godotengine.org/asset-library/api
-
-# Create a symlink of packages to specified path
-${command} link "ResolutionManagerPlugin" "godot-hmac" --path tests/tests-godot-project
-${command} link -f packages.txt --path tests/test-godot-project
-
-# Similarly, make a copy of packages to a project
-${command} clone "ResolutionManagerPlugin" "godot-hmac" --path tests/tests/godot-project
-${command} clone -f packages.txt --path tests/tests-godot-project/addons
-
-# Clean temporary downloaded files if they're taking up too much space. If no package names are provided, all temporary files will be removed.
-${command} clean "ResolutionManagerPlugin"
-${command} clean