parser: create a block node type

Since the next step to pipa programming language is about having control
flow statements we could benefit ourselves by having a block node to
control scope. Now, functions has a block node, instead of an vector as
body. As you can see through the ast-dump:

  FunctionDecl name='main'
  └─ body:
    └─ Block
      └─ ReturnStmt
        └─ Literal type=i32 value='69'

This same node kind can be used for parsing if, for and while blocks.

I could use ast_block_t as body for functions but instead, I opted to
use an ast_node_t. This brings the flexibility to, in the future, having
another function body kinds, such as arrow functions if we want to:

  fn add(a: i32, b: i32): i32 => a + b;

Signed-off-by: Carlos Maniero <carlos@maniero.me>

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