[Feature] : Loop control statements: `break`

[pacifiquem]

file : src/runtime/eval/statements.ts, on eval_loop method.

break : this keyword will stop kin's loop.
continue : this keyword will skip current iteration and go to the next one.

[valentindush]

5/8

[pacifiquem]

We'll start to work on this once #146 is resolved.

[pacifiquem]

We'll use these keyworks for continue and break in kin as per @ndungtse in #146 (comment)

[pacifiquem]

Continue will be worked on in #161