feat: uint1-256 and int1-257 serialization formats for Ints

[novusnota]

Closes #374

Done according to built-in types of TL-B & TON: https://docs.ton.org/develop/data-formats/tl-b-language#built-in-types.

• [x] I have updated CHANGELOG.md
• [x] I have described my contribution in Tact Docs: https://github.com/tact-lang/tact-docs/issues/346
• [x] I have added tests to demonstrate the contribution is correctly implemented: this usually includes both positive and negative tests, showing the happy path(s) and featuring intentionally broken cases
• [x] I have run all the tests locally and no test failure was reported
• [x] I have run the linter, formatter and spellchecker
• [x] I did not do unrelated and/or undiscussed refactorings