Adding support for arrays

[aditya87]

What does this PR do?

Adds support for arrays and. basic array operations.

What packages have been affected by this PR?

parser, interpreter

Types of changes

Adds the following features.

• Declaring arrays
• Assigning array values at index
• Access array values at index, and using them in expressions.

Some examples:

1. basic arrays

      hi bhai
        bhai ye hai b = 2;
        bhai ye hai a = [1, b + 2, 3];
        bol bhai a;
        bol bhai a[0];
        bol bhai a[1];
        bol bhai a[2];
        bol bhai a[3];
      bye bhai

output:

[1, 4, 3]
 1
 4
 3

2. array access and length loop (new bhai-lang keyword ka lambai)

      hi bhai
        bhai ye hai a = [-1, 0, 3, 5];
        a[3] = -5;

        bol bhai a;
        bol bhai a[1];

        bhai ye hai i = 0;
        jab tak bhai (i < a ka lambai) {
          a[i] += 2;
          i += 1;
        }
        bol bhai a;
      bye bhai

output:

[-1, 0, 3, 5]
0
[1, 2, 5, -3]

3. inner arrays

hi bhai
        bhai ye hai a = [-1, 0, 3, [1, 2]];
        bhai ye hai k = a[3];
        k[0] = -5;
        bol bhai a;
      bye bhai

output:

[-1, 0, 3, [-5, 2]]

What types of changes does your code introduce to this project?

Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)

• New feature (non-breaking change which adds functionality)

• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Package version increase in cli package?

No

Checklist before merging

Put an x in the boxes that apply

• These changes have been thoroughly tested.

• Changes need to be immediately published on npm.

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