Function tryParseInterval

tryParseInterval(name: string): ParseResult<SpelledInterval>
Parse an interval name, reporting failure instead of throwing it.

The same reading as parseInterval — that function is this one with its error thrown — for the callers where a name that does not parse yet is the normal state of the input rather than a fault.
Parameters
- name: string
  The interval name.
Returns ParseResult<SpelledInterval>
The interval, or the error explaining why the text is not one.
Example
```
import { tryParseInterval } from '@libraz/libcantus';
const result = tryParseInterval('M5');
result.ok ? result.value.semitones : result.error.message; // a fifth cannot be major
```
- Defined in src/core/pitch/index.ts:728