Speeding up regex match time for custom warnings

[amoghrajesh]

Using re module instead of re2 is much slower when it comes to regex parsing for custom warning messages. Ran the tests with sample data collected with chars of length: [10000, 20000, 40000, 80000, 160000] and the data is like this:

re
10000 - 0.771
20000 - 2.832
40000 - 11.319
80000 - 45.899
160000 - 181.397

re2
10000 - 0.374
20000 - 1.232
40000 - 4.882
80000 - 19.732
160000 - 79.046

The plot looks like this: (re vs re2) (input size vs time taken)

This PR overrides _escape in rich.markup's escape with re2 equivalent

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[amoghrajesh]

Thanks for the reviews. Merging it