fix(libmdbx): Some options can only be set after mdbx_env_open

[wtdcode]

I'm building some application solely relying on reth libmdbx bindings because it's more actively maintained.

When trying to setup MDBX_opt_sync_bytes and MDBX_opt_sync_period, this returns EPERM which is confusing. After digging into the code, the two options are guarded by:

  case MDBX_opt_sync_bytes:
    // ...
    if (unlikely(!(env->me_flags & MDBX_ENV_ACTIVE)))
      return MDBX_EPERM;

And the only place to set MDBX_ENV_ACTIVE is in mdbx_env_open:

    env->me_flags = (flags & ~MDBX_FATAL_ERROR) | MDBX_ENV_ACTIVE;

Therefore, the two options should be set after mdbx_env_open.

I have checked other options and these two seem the only special ones. I also added EPERM error type to libmdbx::Error.