[FLINK-21384][docs] Automatically copy maven dependencies to clipboard on click

[sjwiesman]

Flink has a number of optional dependencies users may need to copy into their pom files to use, such as connectors and formats. The docs should automatically copy the maven dependency to the users' clipboard when clicked.

For example the kafka connector before click:

After click:

The module is highlighted, an alert shown, and the pom dependency is on the users' clipboard.

If a page has multiple dependencies listed, such as elastic, only one is copied at a time and when a new dep is copied the old alert goes away.

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Last check on commit 3ab70c7 (Fri Feb 19 07:33:54 UTC 2021)

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CI report:

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