Union types

[hungthai1401]

Hi @WendellAdriel ,
This PR introduces union types. I use flow chart to explain my implementation.

flowchart TD
    A[StrictusUnion] --> B{Validate Types}
    B -->|Yes| C{Validate Value}
    B -->|No| Z[StrictusTypeException]
    C -->|Yes| D{Detect Value Type}
    C -->|No| Z[StrictusTypeException]
    D -->|Int| E[StrictusInteger]
    D -->|String| G[StrictusString]
    D -->|Float| H[StrictusFloat]
    D -->|Boolean| I[StrictusBoolean]
    D -->|Array| K[StrictusArray]
    D -->|Object| L[StrictusObject]
    D -->|Class| M[StrictusInstance]
    D -->|Enum| N[StrictusEnum]
    D -->|No| Z[StrictusTypeException]
    A[StrictusUnion] --> F[Update Value] --> O{Immutable}
    O -->|Yes| Y[ImmutableStrictusException]
    O -->|No| C

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Greetings and thanks,
Thai

[WendellAdriel]

Besides the changes requested, you need to add the needed docs for the Union types

[WendellAdriel]

@hungthai1401 thanks for the PR.
I added some observations.

Also, please beware that as we put in the Contributing Guide, before creating a whole new feature that's a big change like this one, an issue or a discussion should be used to discuss it first. We have a discussion open on this topic, before sending the PR you could have sent your idea there first.

[hungthai1401]

@WendellAdriel I got it. I have fixed your comments

[hungthai1401]

@WendellAdriel I have fixed them

[WendellAdriel]

Thanks for the help with this, @hungthai1401!!!

[hungthai1401]

@WendellAdriel hope we can develop more features!!!