fix[codegen]: fix make_setter overlap in dynarray_append

[charles-cooper]

What I did

fix #4056, which is another make_setter overlap bug

variant of #4037 and #3410

additionally adds an internal assertion to prevent future variants

How I did it

How to verify it

Commit message

`make_setter` can potentially run into overlap when called from
`dynarray_append`; this commit copies to a temporary intermediate buffer
(as is done in `AnnAssign`) before copying to the destination if the
condition is detected.

this is a variant of the bugs fixed in ad9c10b0b98e2d and 1c8349e867b2b.

this commit also adds a util function to detect overlap, and adds an
assertion directly in `make_setter` so that future variants panic
instead of generating bad code.

Description for the changelog

Cute Animal Picture

[cyberthirst]

currently we don't handle ann_assign well

this will panic

interface Bar:
    def bar() -> Bytes[2]: payable


@external
def foo() -> Bytes[2]:
    x: Bytes[2] = extcall Bar(self).bar()
    return x

[cyberthirst]

also this due to the internal buffer variable on lhs

BLUEPRINT: immutable(address)

@deploy
def __init__(blueprint_address: address):
    BLUEPRINT = blueprint_address

@external
def test(code_ofst: uint256) -> address:
    return create_from_blueprint(BLUEPRINT, code_offset=code_ofst)

[codecov]

Codecov Report

Attention: Patch coverage is 19.04762% with 17 lines in your changes are missing coverage. Please review.

Project coverage is 55.21%. Comparing base (dcec257) to head (74d1b85).

❗ Current head 74d1b85 differs from pull request most recent head 2b93d79

Please upload reports for the commit 2b93d79 to get more accurate results.

Files	Patch %	Lines
vyper/codegen/core.py	33.33%	4 Missing and 4 partials ⚠️
vyper/codegen/expr.py	0.00%	8 Missing ⚠️
vyper/codegen/stmt.py	0.00%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #4059       +/-   ##
===========================================
- Coverage   91.23%   55.21%   -36.03%     
===========================================
  Files         108      107        -1     
  Lines       15499    15466       -33     
  Branches     3404     3401        -3     
===========================================
- Hits        14141     8540     -5601     
- Misses        927     6304     +5377     
- Partials      431      622      +191     

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