RFR: 8261160: Add a deserialization JFR event [v4]

[Daniel Fuchs]

On Thu, 11 Feb 2021 15:53:06 GMT, Chris Hegarty <chegar at openjdk.org> wrote:

>> This issue adds a new event to improve diagnostic information of Java deserialization. The event captures the details of deserialization activity from ObjectInputStream. The event details are similar to that of the serial filter, but is agnostic of whether a filter is installed or not. The event also captures the filter status, if there is one.
>
> Chris Hegarty has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Filter **C**onfigured

LGTM

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Marked as reviewed by dfuchs (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/2479