Update CI & build.fsx script for more functionality OOTB

[shayanhabibi]

Am rewriting build scripts on repos with my tools as an exercise.

Feel free to take it or leave it - it lets you bump, test, build, pack, publish from the script --help for each to see what they do.

dotnet fsi src/build.fsx -- --help

# Version bump project, not usable from CI for safety
# patch bump default
dotnet fsi src/build.fsx -- bump
# prerelease bump
dotnet fsi src/build.fsx -- bump pr
# build without restore
dotnet fsi src/build.fsx -- build --quick

[JordanMarr]

Thanks for putting this together — Partas.Build is a genuinely creative idea and it was interesting to see the script expressed with it. After sitting with it, though, I'm going to leave it: I want to keep the build script small enough that I can read it at a glance, keep publishing on the deliberate manual trigger, and avoid adding a second build-tooling dependency in the path that holds the NuGet publish key. Appreciate you offering it as take-it-or-leave-it. Closing, but thanks again!