Modularize security_manager by moving report logic (#37347)

Move all report structs into the same file, to
keep them consistent and reuse functions such as stripping
of the URL and serialization of disposition. This is part
of modularizing security_manager, which contained various
logic related to CSP.

Part of #4577

Signed-off-by: Tim van der Lippe <tvanderlippe@gmail.com>

components/script/dom/mod.rs

@@ -263,6 +263,7 @@ pub(crate) mod countqueuingstrategy;
 mod create;
 pub(crate) mod crypto;
 pub(crate) mod cryptokey;
+pub(crate) mod csppolicyviolationreport;
 pub(crate) mod css;
 pub(crate) mod cssconditionrule;
 pub(crate) mod cssfontfacerule;