[feat] Namespaced Instructions

[ngundotra]

The goal of this PR is to add namespaces to instructions and optionally allow method names to be overridden in the IDL.

Methods can now be optionally overriden in 1 of 2 ways.

// 1. Instruction discriminator is result of sighash("my-interface", "my_func")
#[ix(namespace="my-interface")]
pub fn my_func(...) -> Result<()> {
}

// 2. Instruction discriminator is result of sighash("my-interface", "other_func")
// In this case, this instruction will have name `other-func` in the IDL
#[ix(namespace="my-interface", name="other-func")]
pub fn my_func(...) -> Result<()> {
}

In order to call namespaced methods in typescript, a new field has been added to the Program object in the anchor TS package.

// 1. Explicit namespace "myInterface"
program
  .namespace
  .myInterface
  .myFunc(...args)
  ....

// 2. Overridden instruction name "other-func"
program
  .namespace
  .myInterface
  .otherFunc(...args)
  ....

[vercel]

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