Convert mailer_emoji JSON file to map

[adamantike]

This fixes a pending TODO comment regarding inefficient tags to emojis mapping, by requiring a full scan over emoji aliases to determine matches.

Instead, now the JSON file is a map, with aliases as keys, and emojis as values. The script to convert the file with Python was:

import json

with open("./server/mailer_emoji.json", "r", encoding="utf-8") as f:
    content = json.load(f)

emoji_map = {}
for emoji in content:
    for alias in emoji["aliases"]:
        if alias in emoji_map:
            print("WARNING: Duplicate alias:", alias)
            continue
        emoji_map[alias] = emoji["emoji"]

sorted_emoji_map = {k: emoji_map[k] for k in sorted(emoji_map)}

with open("./server/mailer_emoji_map.json", "w", encoding="utf-8") as f:
    json.dump(sorted_emoji_map, f, indent=4, ensure_ascii=False)

[codecov-commenter]

Codecov Report

Patch coverage: 85.71% and project coverage change: +0.01 🎉

Comparison is base (bd81aef) 66.34% compared to head (49bd612) 66.36%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #725      +/-   ##
==========================================
+ Coverage   66.34%   66.36%   +0.01%     
==========================================
  Files          48       48              
  Lines        6873     6871       -2     
==========================================
  Hits         4560     4560              
+ Misses       1601     1600       -1     
+ Partials      712      711       -1     

Impacted Files	Coverage Δ
server/smtp_sender.go	52.74% <85.71%> (-1.02%)	⬇️

... and 1 file with indirect coverage changes

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[binwiederhier]

Thanks