tensor pretty print & summarize

[macroexpansion]

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Checklist

• Confirm that run-checks script has been executed.

Related Issues/PRs

#850

Changes

• I have refactored methods display_recursive, fmt_inner_tensor, fmt_outer_tensor and push_newline_indent to pretty print tensor and print ellipses (summarizing) when tensors get too large.
• Added PrintOptions to control how and when tensor will be pretty printed and summarized.
• This implementation is similar to candle's implementation for pretty print.
• Fixed old test cases to work with pretty print.

Testing

• Added test cases to summarize large tensors.

[nathanielsimard]

LGTM @louisfd do you see something we should change before we merge?

[louisfd]

I tested it on @macroexpansion 's fork. It works well! I'll merge it