syn: relax entry 'info lifetime for compat. with solana-program-test

[tilacog]

This PR removes the 'info lifetime constraint from the AccountInfo slice.

This change was necessary for passing Anchor's program::entry to the solana-test-program's ProgramTest::add_program method.

Here's a sample of the lifetime mismatch, before this PR's changes:

error[E0308]: mismatched types
   --> my_program/tests/integration.rs:23:65
    |
23  |     program.add_program("test-program", my_program::ID, processor!(my_program::entry));
    |                                                      -----------^^^^^^^^^^^^^^-
    |                                                      |          |
    |                                                      |          one type is more general than the other
    |                                                      arguments to this function are incorrect
    |
    = note: expected fn pointer `for<'a, 'b, 'c, 'd> fn(&'a Pubkey, &'b [AccountInfo<'c>], &'d [u8]) -> Result<_, _>`
                  found fn item `for<'info, 'a, 'b> fn(&'a Pubkey, &'info [AccountInfo<'info>], &'b [u8]) -> Result<_, _> {entry}`
note: function defined here
   --> /home/user/.cargo/registry/src/index.crates.io-6f17d22bba15001f/solana-program-test-1.17.6/src/lib.rs:101:8
    |
101 | pub fn invoke_builtin_function(
    |    

[vercel]

@tilacog is attempting to deploy a commit to the coral-xyz Team on Vercel.

A member of the Team first needs to authorize it.

[tilacog]

The Anchor crates compile, but actual usage of #[program] breaks compilation.

Error from my project:

❯ cargo check
    Checking registry v0.1.0 (/home/tilacog/tiago/code/eiger/axelar/solana-axelar/solana/programs/registry)
error[E0621]: explicit lifetime required in the type of `accounts`
 --> programs/registry/src/lib.rs:8:1
  |
8 | #[program]
  | ^^^^^^^^^^
  | |
  | lifetime `'info` required
  | help: add explicit lifetime `'info` to the type of `accounts`: `&'info [anchor_lang::prelude::AccountInfo<'info>]`
  |
  = note: this error originates in the attribute macro `program` (in Nightly builds, run with -Z macro-backtrace for more info)

For more information about this error, try `rustc --explain E0621`.
error: could not compile `registry` (lib) due to previous error

My familiarity with Anchor derive macros is limited, but I am open to discussing the problem further to refine this contribution.

[acheroncrypto]

I think this would be much easier to fix by creating a new processor! macro with Anchor's current lifetimes because the same lifetime constraints exist in many places.

[oeble]

Modifying the macro only is not enough. The issue comes from the signature expected by invoke_builtin_function itself. I think the changes to lifetime and references done in anchor need a bit more work to accommodate all the existing use cases.