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I have had this exact problem when first trying to load Minecraft through Eclipse. I found I had to restart by re-downloading forge (MDK version), but save any mod code through text files in a folder as a recommendation. Run the gradle cmd and exit it when finished. Then use "cd " followed by the directory to your forge folder, and continuing in the order of: "gradlew clean" "gradlew genEclipseRuns" "gradlew Eclipse" Run Minecraft in Eclipse before continuing to re-add any code back to ensure it isn't any code that is preventing Minecraft from running. I found sometimes going outside the command order could result in failures such as the one you are currently experiencing. Yes it was a pain cause I on the other hand didn't save all my code in text files... This is for the latest recommended version of forge in 1.14.4, I am unsure if this is the same in prior versions of the game.

If you used ray tracing to represent the bullet, and didn't use an Entity at all. Your ray tracing would happen in a single tick before the target of the shooter could move. Long range shots would be instant. There would be no leading your shot.

I see no reason for that to not generate a client run config. Run eclipse and genEclipseRuns, then click into Package Explorer and press F5

I mean please provide the build.gradle that controls the mod's configuration and build process

This is completely possible you have to use the CompoundNBT#put(String, INBT) method. There is no specific method for compounds or lists. Also ListNBT can be a list of CompoundNBT so you can store any and all data complex or simple.

GradleStart no longer exists and you need to configure more than that to get Forge to load mods in dev. Please provide your build.gradle

I should also mention that Eclipse doesn't listen for filesystem changes, you have to refresh the project(F5 or right click in the file hierarchy) for it to detect the runconfigs that ForgeGradle generates