Validate option names contain only alphanumeric characters plus _ and -

Add validation to ensure option names are alphanumeric plus underscore and hyphen characters.

**Current behavior:** No validation

**Desired behavior:** Return false if the resulting name is not valid, forcing the value to be treated as an operand instead of throwing a not-found option error.

**Location:** `CommandDotNet/Parsing/CommandParser.cs:331-332`