[AsmParser][SystemZ][z/OS] Add support to AsmLexer to accept HLASM style integers

- Add support for HLASM style integers. These are the decimal integers [0-9].
- HLASM does not support the additional prefixed integers like, `0b`, `0x`, octal integers and Masm style integers.
- To achieve this, a field `LexHLASMStyleIntegers` (similar to the `LexMasmStyleIntegers` field) is introduced in `MCAsmLexer.h` as well as a corresponding setter.

Note: This field could also go into MCAsmInfo.h. I used the previous precedent set by the `LexMasmIntegers` field.

Depends on https://reviews.llvm.org/D99286

Reviewed By: epastor

Differential Revision: https://reviews.llvm.org/D99374