Optimise memberSort performance for large list

[germain-gg]

There is a UI blocking operation for large member list, taking approximately 1.2 seconds to sort the array which made me look at what is causing the issue

The culprit was String.prototype.localeCompare. It turns out that creating an Intl.Collator ahead of time speads up the process immensely
Minor optimisations were also made to avoid applying regexes on every sort callback

I went ahead and replaced every occurence of localeCompare in the rest of the platform to use Intl.Collator. We will likely get a performance boost in room list filtering for large accounts as it was using localeCompare there

Before 🐌

After 🐎

[t3chguy]

lgtm other than the import