Create MessagePacket structure

[drazisil]

No description provided.

[codecov]

Codecov Report

Merging #1163 (2fec540) into main (1e33c5a) will increase coverage by 0.14%.
The diff coverage is 68.85%.

Impacted Files	Coverage Δ
packages/mcos-lobby/src/internal.ts	27.24% <10.00%> (-0.62%)	⬇️
packages/mcos-lobby/src/index.js	30.48% <16.66%> (-0.23%)	⬇️
packages/mcos-persona/src/internal.ts	29.14% <16.66%> (-0.10%)	⬇️
...ckages/mcos-shared/src/structures/MessagePacket.ts	100.00% <100.00%> (ø)
packages/mcos-shared/src/structures/index.js	100.00% <100.00%> (ø)