fix(statements): Use prefixed strings to avoid internal conflicts

[LuanRT]

This fixes an issue where a conflic with reserved keywords would happen inside the interpreter if a string being evaluated was 'break' or 'continue'.

Related issues:
LuanRT/YouTube.js#905
FreeTubeApp/FreeTube#6845
iv-org/invidious-companion#50
FreeTubeApp/FreeTube#6701
imputnet/cobalt#1123

Example:

var arr = ['a', 'break', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l'];
arr[0] = arr;

function mod(I, u) {
    if (I.length != 0) {
        u = (u % I.length + I.length) % I.length;
        var test = I[0];  // Circular reference.
        console.log('Array ref:', test);
        const breakString = I[u];
        console.log({
            iVal: I[u],
            u: I[0]
        })
        // The interpreter will halt here and jump to the 
        // end of the function.
        // So I[u] = test is never executed.
        I[0] = breakString;
        console.log({
            iVal: I[0]
        })
        I[u] = test;
        console.log({
            iVal: I[u]
        });
    }
}

mod(arr, 1);

Expected output:

Array ref: <ref *1> [
  [Circular *1],
  'break',
  'c',
  'd',
  'e',
  'f',
  'g',
  'h',
  'i',
  'j',
  'k',
  'l'
]
{
  iVal: 'break',
  u: <ref *1> [
    [Circular *1],
    'break',
    'c',
    'd',
    'e',
    'f',
    'g',
    'h',
    'i',
    'j',
    'k',
    'l'
  ]
}
{ iVal: 'break' }
{
  iVal: <ref *1> [
    'break',
    [Circular *1],
    'c',
    'd',
    'e',
    'f',
    'g',
    'h',
    'i',
    'j',
    'k',
    'l'
  ]
}

Current output:

Array ref: <ref *1> [
  [Circular *1], 'break',
  'c',           'd',
  'e',           'f',
  'g',           'h',
  'i',           'j',
  'k',           'l'
]
{
  iVal: 'break',
  u: <ref *1> [
    [Circular *1], 'break',
    'c',           'd',
    'e',           'f',
    'g',           'h',
    'i',           'j',
    'k',           'l'
  ]
}