Tracking PR for v0.2 release

[tohrnii]

This PR will track progress of v0.2 release of AirScript.

• Tracking issue: core functionality for Miden VM constraints #75
  • Add Sub to IR #68
    • Addition of Sub operation #80
  • merge boundary constraints into AlgebraicGraph and support variables #106
    • refactor: replace row_offset with ConstraintDomain #117
    • Add boundary constraints to the constraint graph #126
    • Add support for boundary variables #160
  • Consider making trace reference more general in the IR #54
    • Make the trace reference more general in the IR #92
  • Add validity constraints #84
    • Rename transition constraints to integrity constraints #105
    • Differentiate between validity and transition constraints in constraint graph #111
• Tracking issue: Improved ergonomics for defining constraints in AirScript #77
  • Add support for intermediate variables (scalars, vectors, matrices) #61
    • Add support for variables to parser #65
    • Variables IR and Codegen #100
  • Add support for declaring named constants (scalars, vectors, matrices) #60
    • Add support for parsing of constants #63
    • Add constants support to IR #94
    • Add support for constants to codegen #95
  • Add support for grouping of trace columns to parser #83
    • Add support for trace col grouping #101
  • Update IR to preserve column groupings for codegen #85
    • Add trace column grouping to IR #102
  • Consider moving constants to the top of the AirScript file #89
    • refactor(parser): move constant declarations to top of file #103
  • add support for $main and $aux built-ins #26
    • Add support for $main and $aux built-ins #112
  • List Comprehension #87
    • Add support for list comprehensions to parser #119
    • Add list folding to parser #127
  • Add section for random values and allow declaring names for accessing random values #86
    • Parsing of Individual section of random values #129
    • Adding random values to IR #134
• chore: add changelog for v0.1 and v0.2 #161

[grjte]

Looks good!