Function longestComSubsequence

longestComSubsequence(aStr: string, bStr: string): number
Compute the length of the longest common subsequence of two strings.

Usage:
```
import { longestComSubsequence } from "mazey";

const ret = longestComSubsequence("fish", "finish");
console.log(ret);
```
Output:
```
4
```
Parameters
- aStr: string
  The first string.
- bStr: string
  The second string.
Returns number
The length of the longest common subsequence.
- Defined in calc.ts:225