feat(botapi): initial message sending support

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[codecov]

Codecov Report

Merging #42 (7a42ad8) into main (63059b4) will decrease coverage by 0.37%.
The diff coverage is 29.05%.

@@            Coverage Diff             @@
##             main      #42      +/-   ##
==========================================
- Coverage   33.47%   33.10%   -0.38%     
==========================================
  Files           6       34      +28     
  Lines         953     2462    +1509     
==========================================
+ Hits          319      815     +496     
- Misses        628     1616     +988     
- Partials        6       31      +25     

Impacted Files	Coverage Δ
botdoc/oas.go	0.00% <ø> (ø)
internal/botapi/file_id.go	0.00% <0.00%> (ø)
internal/botapi/stickers.go	0.00% <0.00%> (ø)
internal/botstorage/bbolt.go	0.00% <0.00%> (ø)
internal/pool/client.go	0.00% <0.00%> (ø)
internal/pool/pool.go	0.00% <0.00%> (ø)
internal/pool/token.go	0.00% <0.00%> (ø)
internal/botapi/errors.go	1.83% <1.83%> (ø)
internal/botapi/convert_message.go	10.85% <10.85%> (ø)
internal/botapi/options.go	25.00% <25.00%> (ø)
... and 20 more

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