RFR: 8082: Add ctrl+a keyboard shortcut to select all lanes on jfr threads page [v2]

[Marcus Hirt]

On Sat, 10 Jun 2023 02:23:05 GMT, Alex Macdonald <aptmac at openjdk.org> wrote:

>> This PR addresses JMC-8082 [[0]](https://bugs.openjdk.org/browse/JMC-8082), in which it'd be nice to easily select all the threads on the jfr threads page using a keyboard shortcut. Inspired by https://github.com/openjdk/jmc/pull/492, it would be nice to add more "table" behaviour to the jfr threads page text canvas. In this case, the keyboard shortcut ctrl+a will highlight all of the thread lanes and update the current selection.
>> 
>> [0] https://bugs.openjdk.org/browse/JMC-8082
>
> Alex Macdonald has updated the pull request incrementally with one additional commit since the last revision:
> 
>   make spotless happy

Marked as reviewed by hirt (Lead).

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PR Review: https://git.openjdk.org/jmc/pull/493#pullrequestreview-1473668145