Changes:
marshallpierce/rust-base64@v0.13.1...v0.21.0
`base64::{encode,decode}` are now deprecated in favor of an API that
explicitly selects an `Engine`. Migrated all calls to the new API.
* Moves stable_log::program_invoke(), stable_log::program_success() and stable_log::program_failure() calls from bpf_loader into InvokeContext::process_executable_chain().
* Turns result of ProcessInstructionWithContext from InstructionError into Box<dyn std::error::Error>.
* Bump to solana_rbpf v0.3.0
* Removes Result from return type of EbpfVm::new().
* Turns EbpfError into Box<dyn std::error::Error>.
* Removes BpfError.
* Removes SyscallError::InstructionError.
* Adds a type alias for Box<dyn std::error::Error> in syscalls.
* Moves the Executor dyn Trait to instruction_processor.rs
* Moves the Logger dyn Trait as well as the ic_msg and ic_logger_msg macros to log_collector.rs,
and moves the stable_log to stable_log.rs
* Moves the ComputeMeter dyn Trait to invoke_context.rs
* Moves the InvokeContext dyn Trait and the ProcessInstructionWithContext type to invoke_context.rs
* Updates cargo files.
* Re-export InvokeContext in program-test
Co-authored-by: Jon Cinque <jon.cinque@gmail.com>