fix: opcodes and opcodes_runtime outputs

[trocher]

What I did

Fixed the opcodes and opcodes_runtime outputs as they would not respectively match the bytecode and bytecode_runtime outputs.

The value following a PUSH instruction could be incorrect. For example, when compiling some Vyper code that results in PUSH2 0x100:

• The bytecode output would be 610100
• The opcodes output would be PUSH2 0x10 instead of PUSH2 0x100

This issue is due to a lack of 0 padding.

How I did it

In build_opcodes, left pad each byte to be concatenated with 0 to have a length of 2 digits

How to verify it

Check the tests

Commit message

Fixed the opcodes and opcodes_runtime outputs as they would not
respectively match the bytecode and bytecode_runtime outputs.

The value following a PUSH instruction could be incorrect. For example,
when compiling some Vyper code that results in `PUSH2 0x0100`:

- The bytecode output would be `610100`
- The opcodes output would be `PUSH2 0x10` instead of `PUSH2 0x0100`

Note this commit fixes an ambiguity here, as prior to this commit,
`610100` (`PUSH2 0x0100`) and `610010` (`PUSH2 0x0010`) would both get
formatted as `PUSH2 0x10`.

This issue is due to a lack of 0 padding.

Description for the changelog

fix: opcode and opcodes_runtime outputs

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (81c6d8e) 84.18% compared to head (5744d71) 84.78%.
Report is 2 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3735      +/-   ##
==========================================
+ Coverage   84.18%   84.78%   +0.60%     
==========================================
  Files          92       92              
  Lines       13143    13137       -6     
  Branches     2928     2929       +1     
==========================================
+ Hits        11064    11138      +74     
+ Misses       1659     1535     -124     
- Partials      420      464      +44     

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[pcaversaccio]

@charles-cooper we should definitely document this behaviour in the docs. To make everyone's life easier, I already opened a separate PR: #3736.