misc: add flattened_values to LiteralExprAST

[superlopuh]

The first of a number of smaller atomic changes used in Chapter 2 of the MLIR tutorials.

[codecov]

Codecov Report

Base: 87.91% // Head: 87.86% // Decreases project coverage by -0.05% ⚠️

Coverage data is based on head (e03f3a5) compared to base (2d69772).
Patch coverage: 37.50% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #378      +/-   ##
==========================================
- Coverage   87.91%   87.86%   -0.05%     
==========================================
  Files          70       70              
  Lines        8546     8553       +7     
  Branches     1364     1366       +2     
==========================================
+ Hits         7513     7515       +2     
- Misses        756      761       +5     
  Partials      277      277              

Impacted Files	Coverage Δ
docs/Toy/toy/toy_ast.py	62.71% <37.50%> (-1.41%)	⬇️

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