[TensorIR] add TIRTextPrinter support for Block and BlockRealize

[Hzfengsy]

Currently, there are three printers for TIR:

1. ReprPrinter: Text printer for stmt node. (e.g. print(for_loop))
2. TIRTextPrinter: Text printer for function or module. (e.g. print(prim_func))
3. TVMScriptPrinter: Python syntax printer for function or module.

Note that TIRTextPrinter and TVMScriptPrinter are designed for round-trip printing and parsing, which may contain necessary info for reconstructing the AST (TIRTextPrinter is designed for it but has not supported now). In this PR, I add TIRTextPrinter support for Block and BlockRealize. Then all three printers and one parser (TVMScriptParser) support TensorIR.

Example

#[version = "0.0.5"]
primfn() -> () {
  block([16, tir.reduce_axis(0, 16)], "block") as [vx, vy] {
    bind(vx, x)
    bind(vy, y)
    tir.reads([buffer[vx, vy]])
    tir.writes([buffer_2[vx]])
    tir.attrs({"attr_key": "attr_value"})
    buffer_4 = alloc_buffer(float32[16, 16])
    buffer_5 = match_buffer_region(buffer[0:16, 0:16])
    with init() {
      buffer_2[vx] = 0f32
    }
    buffer_2[vx] = (buffer_2[vx] + buffer[vx, vy])
}

cc @tqchen @junrushao1994

[junrushao]

LGTM