registerContracts in gauntlet-solana should not depend on Environment

[kylesmartin]

This function has still some issues, essentially:

• Depends on an static path to read artifacts. (What if those artifacts are not in the FS?)
• Depends on the environment to load the program Ids. (What if some gauntlet-solana consumer chooses another way to store their ProgramIds? We would be forcing them to include it into the env)

Originally posted by @RodrigoAD in #284 (comment)