Tag TOSA specification for 0.21.0 release Functional changes: - MUL, add right shift on 32x32 bit multiply - ARITHMETIC_RIGHT_SHIFT: add rounding - RESIZE: add float type - Add int48 to supported number formats - Add SCATTER operator Descriptive changes: - Pseudocode cleanup, usage clarifications - Fix various rank limitations - Rewrite the introduction for improved clarity - Improve the documentation for attributes and inputs for training profile vs. inference profiles.