fix: annotate lll nodes returned by Expr and Stmt

[skellet0r]

What I did

Minor quality of life improvement when viewing LLL.
This takes the work done in commit 5150ae1 and expands it to annotate all LLL nodes created by Stmt and Expr.

How I did it

Pretty simple, just set the annotate attribute during the init of both classes.

How to verify it

I'd recommend taking the diff of the output of vyper -f ir between the commits 12a8b6a (master) and 15a3816 (this PR)

Description for the changelog

fix: better annotate the LLL output produced via vyper -f ir

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[codecov-commenter]

Codecov Report

Merging #2486 (15a3816) into master (12a8b6a) will increase coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #2486      +/-   ##
==========================================
+ Coverage   84.54%   84.56%   +0.02%     
==========================================
  Files          93       93              
  Lines        9237     9237              
  Branches     2091     2091              
==========================================
+ Hits         7809     7811       +2     
+ Misses        939      938       -1     
+ Partials      489      488       -1     

Impacted Files	Coverage Δ
vyper/old_codegen/expr.py	79.10% <100.00%> (+0.04%)	⬆️
vyper/old_codegen/stmt.py	87.94% <100.00%> (-0.06%)	⬇️
vyper/lll/optimizer.py	84.07% <0.00%> (+1.27%)	⬆️

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[charles-cooper]

awesome!