Add text formatters, add some crypto checks

[tdakkota]

Updates #155.

[codecov]

Codecov Report

Merging #156 (98a9555) into main (9bc6d57) will decrease coverage by 0.42%.
The diff coverage is 50.00%.

@@            Coverage Diff             @@
##             main     #156      +/-   ##
==========================================
- Coverage   68.67%   68.25%   -0.43%     
==========================================
  Files         177      178       +1     
  Lines        4939     5059     +120     
==========================================
+ Hits         3392     3453      +61     
- Misses       1190     1245      +55     
- Partials      357      361       +4     

Impacted Files	Coverage Δ
internal/exchange/client_flow.go	53.54% <28.57%> (-3.40%)	⬇️
telegram/message/format.go	50.96% <50.96%> (ø)
internal/crypto/cipher_decrypt.go	56.75% <83.33%> (+6.75%)	⬆️
mtproto/read.go	53.84% <0.00%> (+2.19%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 9bc6d57...98a9555. Read the comment docs.