Add possibility to allowlist scriptlets

[superlex]

uBlock Origin supports
example.org#@#+js()
to defuse all scriptlets in example.org.

AdGuard should support
example.org#@%#//scriptlet() or example.org#@%#//scriptlet('')
to do the same thing and convert the first one into that.

Furthermore, AdGuard could also add the ability to defuse a specific scriptlet.
For example, if you have

example.org#%#//scriptlet('set-local-storage-item', 'aditem1', '1')
example.org#%#//scriptlet('set-cookie', 'adcook1', '1')
example.org#%#//scriptlet('set-cookie', 'adcook2', '2')

then
example.org#@%#//scriptlet('set-cookie')
should defuse only the last two, while
example.org#@%#//scriptlet() or example.org#@%#//scriptlet('')
should defuse all of them.

NB:
uBlock Origin also supports
#@#+js()
(without domain) to suppress all scriptlet in all sites. AdGuard could do the same, if you find it useful.
For example,
#@%#//scriptlet('set-cookie')
(without domain) could defuse all set-cookie scriptlets everywhere.

References:
https://github.com/gorhill/uBlock/wiki/Static-filter-syntax#scriptlet-injection