Merge pull request #2848 in SNORT/snort3 from ~OSERHIIE/snort3:js_inline_scripts...

Merge pull request #2848 in SNORT/snort3 from ~OSERHIIE/snort3:js_inline_scripts to master

Squashed commit of the following:

commit 8d130d92807ecc480c3832e7e85697883bf1ae42
Author: Oleksandr Serhiienko <oserhiie@cisco.com>
Date:   Fri Apr 16 12:48:49 2021 +0300

    http_inspect: add js_inline_scripts peg count

commit 07beb04a28389e09bc0e77f672e86f58e5ef4194
Author: Oleksandr Serhiienko <oserhiie@cisco.com>
Date:   Fri Apr 16 10:31:01 2021 +0300

    http_inspect: identify external javascripts

commit b4e77cf2d524ecc076eb6007d9e1f4743b2852e4
Author: Oleksandr Serhiienko <oserhiie@cisco.com>
Date:   Fri Apr 16 01:34:30 2021 +0300

    http_inspect: add built-in alert for unexpected tags within inline javascript