Refactor exception constants to use number instead of bigint

[skywardboundd]

Currently, the constants used exclusively for exception codes are defined as bigint, but this causes inconsistencies because the exitCode in the core library is of type number.

To improve compatibility and type consistency, we should convert these constants to be of type number instead of bigint, since they are not used in contexts requiring bigint.

https://github.com/ton-org/test-utils/blob/b2e40594da4c95d27f7a0126e4e30b855f7104bd/src/test/transaction.ts#L28

[novusnota]

It is a good idea in theory, but this won't be backward compatible with existing user code and test setups :(

UPD: At least if we assume there are comparisons with other bigint values already — those cases won't pass the type checking if we change the type to number.

[skywardboundd]

It is a good idea in theory, but this won't be backward compatible with existing user code and test setups :(

These constants are only used for checking exitCode, which is already being converted from bigint to number. I don’t think this will break anything — the result will still be a number, so it should be compatible with existing tests and user code.