Pull request #3169: Reset Normalizer's context when new script starts

Pull request #3169: Reset Normalizer's context when new script starts

Merge in SNORT/snort3 from ~OSHUMEIK/snort3:js_buffers_fix to master

Squashed commit of the following:

commit bdee3121765f854f41e2a46b9a2a557408314fab
Author: Oleksii Shumeiko <oshumeik@cisco.com>
Date:   Tue Nov 16 11:18:33 2021 +0200

    utils: reset Normalizer context when new script starts

    Since Normalizer context are no longer recreated for each new script started,
    a method to reset internal state was added.

    If a script continues in the next chunk, then context is not reset,
    but is being prepared to process the new chunk as a continuation.