fix: ir and metadata outputs for vyper-json

[charles-cooper]

What I did

How I did it

How to verify it

try vyper-json on the following

$ cat tmp/meta.json 
{
    "language": "Vyper",
    "sources": {
        "bar.vy": { "content": "@external\ndef foo():\n   pass"}
    },
    "settings": {
        "optimize": true,
        "outputSelection": {
            "*": ["ir", "metadata", "abi", "ast"]
        }
    }
}

Description for the changelog

Cute Animal Picture

[fubuloubu]

Seems fine

[fubuloubu]

Are there duplicates in TRANSLATE_MAP?

[charles-cooper]

Are there duplicates in TRANSLATE_MAP?

yes - I made ir and ir_json both map to ir_json (it doesn't really make sense to get regular ir output for vyper-json when a json version is available).

[codecov-commenter]

Codecov Report

Merging #2600 (3b7633a) into master (13af26b) will increase coverage by 0.03%.
The diff coverage is 62.50%.

@@            Coverage Diff             @@
##           master    #2600      +/-   ##
==========================================
+ Coverage   86.61%   86.65%   +0.03%     
==========================================
  Files          91       91              
  Lines        9430     9433       +3     
  Branches     2357     2358       +1     
==========================================
+ Hits         8168     8174       +6     
+ Misses        776      774       -2     
+ Partials      486      485       -1     

Impacted Files	Coverage Δ
vyper/compiler/__init__.py	87.17% <ø> (ø)
vyper/cli/vyper_json.py	85.43% <62.50%> (+0.17%)	⬆️
vyper/builtin_functions/functions.py	88.60% <0.00%> (+0.33%)	⬆️

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