allow dynamic array iterators

[charles-cooper]

What I did

Allow iterators for dynamic arrays, e.g.

xs: DynArray[uint256, 5] = [1,2,3]
for x in xs:
    if x == 2:
        return x
return -1

How I did it

add cases to parse_For_list and refactor to use more general functions

How to verify it

see tests

Description for the changelog

add iterators for dynamic array types

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[codecov-commenter]

Codecov Report

Merging #2606 (2b00fb0) into master (fe99778) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 2b00fb0 differs from pull request most recent head 7956b71. Consider uploading reports for the commit 7956b71 to get more accurate results

@@           Coverage Diff           @@
##           master    #2606   +/-   ##
=======================================
  Coverage   86.58%   86.59%           
=======================================
  Files          91       91           
  Lines        9439     9438    -1     
  Branches     2362     2362           
=======================================
  Hits         8173     8173           
  Misses        777      777           
+ Partials      489      488    -1     

Impacted Files	Coverage Δ
vyper/semantics/validation/local.py	92.23% <100.00%> (ø)
vyper/compiler/output.py	94.61% <0.00%> (-0.04%)	⬇️
vyper/codegen/core.py	83.11% <0.00%> (ø)
vyper/codegen/types/types.py	84.92% <0.00%> (+0.39%)	⬆️

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