Support bind declaration

[taichi-ishitani]

close #1805

This PR is to introduce bind delcaration.
The introduced syntax is like below.

bind ModuleA <- u: ModuleB (
  i_clk: i_clk,
  i_rst: i_rst,
  i_a  : a    ,
  o_b  : b    ,
);

[codspeed-hq]

CodSpeed Performance Report

Merging #1887 will not alter performance

_{Comparing taichi-ishitani:bind_declaration (e30e19b) with master (cdf3213)}

Summary

✅ 3 untouched benchmarks

[taichi-ishitani]

#1805 (comment)

I removed : put between scoped identifier and identifier.

[taichi-ishitani]

Use <- as a separator between target identifier and instnace identifier.