lang, ts, examples: Remove associated keyword

[armaniferrante]

Closes #491.

[michaelhly]

@armaniferrante, was it not possible to just deprecate the associated attribute instead of removing these outright?

[armaniferrante]

@armaniferrante, was it not possible to just deprecate the associated attribute instead of removing these outright?

On the next release, you can update your code from

#[derive(Accounts)]
pub struct Ix {
  #[account(associated = <target>, with = <target>)]
}

#[associated]
pub struct MyAccount {...}

To the more explicit

#[derive(Accounts)]
pub struct Ix {
  #[account(
     seeds = [b"anchor", <target>.key().as_ref(), <with-target>.key().as_ref()], 
     bump,
  )] 
}

#[account]
#[derive(Default)]
pub struct MyAccount {
 ...
  __nonce: u8,
}

Without breaking changes. If this doesn't work for whatever reason please let me know.

Note that bump will "find" the bump seed for the account and use it. Alternatively, it can be explicitly provided via bump = <u8-expression>, which is recommended to save compute, since Pubkey::create_program_address is cheaper than Pubkey::find_program_address (the syntax for this is subject to change prior to the next release based on feedback).