fix(message): do not copy Builder

[tdakkota]

No description provided.

[codecov]

Codecov Report

Merging #619 (70f65c2) into main (9dfdf37) will increase coverage by 0.11%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #619      +/-   ##
==========================================
+ Coverage   69.27%   69.39%   +0.11%     
==========================================
  Files         400      400              
  Lines       18697    18690       -7     
==========================================
+ Hits        12953    12969      +16     
+ Misses       4906     4876      -30     
- Partials      838      845       +7     

Impacted Files	Coverage Δ
telegram/message/builder.go	80.00% <100.00%> (-3.34%)	⬇️
tgtest/send.go	54.05% <0.00%> (-5.41%)	⬇️
tgtest/loop.go	65.00% <0.00%> (-5.00%)	⬇️
internal/proto/codec/intermediate.go	95.08% <0.00%> (-4.92%)	⬇️
tgtest/server.go	85.45% <0.00%> (-3.64%)	⬇️
internal/mtproto/conn.go	92.22% <0.00%> (-3.34%)	⬇️
tgtest/handle.go	40.19% <0.00%> (ø)
telegram/updates/internal/e2e/storage_mem.go	59.84% <0.00%> (+6.06%)	⬆️
internal/rpc/engine.go	84.18% <0.00%> (+9.60%)	⬆️
telegram/updates/state_apply.go	36.71% <0.00%> (+11.71%)	⬆️

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