fix(lwc-engine): Add Safari polyfill for Proxy

[pmdartus]

Details

Add temporary mitigation to get around Safari Array.prototype.concat bug: https://bugs.webkit.org/show_bug.cgi?id=184267

Does this PR introduce a breaking change?

• Yes
• No

[davidturissini]

It's not clear to my why we want this in lwc and not es5-proxy-compat?

[pmdartus]

Because we don't ship compat on Safari 10.

[salesforce-best-lwc-internal]

Benchmark comparison

Base commit: 13cd8c4 | Target commit: aecdd94

benchmark	base(13cd8c4)	target(aecdd94)	trend
table-append-1k.benchmark:benchmark-table/append/1k	282.33 (± 5.15 ms)	249.79 (± 5.77 ms)	👍
table-clear-1k.benchmark:benchmark-table/clear/1k	15.48 (± 1.46 ms)	12.76 (± 0.34 ms)	👍
table-create-10k.benchmark:benchmark-table/create/10k	1575.65 (± 40.19 ms)	1397.16 (± 16.97 ms)	👍
table-create-1k.benchmark:benchmark-table/create/1k	171.20 (± 4.82 ms)	155.47 (± 3.02 ms)	👍
table-update-10th-1k.benchmark:benchmark-table/update-10th/1k	139.74 (± 3.30 ms)	130.29 (± 2.62 ms)	👍
tablecmp-append-1k.benchmark:benchmark-table-component/append/1k	348.69 (± 6.56 ms)	316.72 (± 5.05 ms)	👍
tablecmp-clear-1k.benchmark:benchmark-table/clear/1k	35.24 (± 0.90 ms)	31.98 (± 0.93 ms)	👍
tablecmp-create-10k.benchmark:benchmark-table-component/create/10k	2668.06 (± 41.49 ms)	2455.85 (± 10.90 ms)	👍
tablecmp-create-1k.benchmark:benchmark-table-component/create/1k	289.73 (± 8.75 ms)	262.17 (± 2.73 ms)	👍
tablecmp-update-10th-1k.benchmark:benchmark-table-component/update-10th/1k	127.75 (± 3.62 ms)	113.75 (± 3.70 ms)	👍

[caridy]

we can probably can simplify this by concating into an empty array.

[diervo]

@pmdartus merging this fix is shipped, lets do backport