Move CryptoOptions to api/crypto from rtc_base/sslstreamadapter.h

Promotes rtc::CryptoOptions to webrtc::CryptoOptions converting it from class
that only handles SRTP configuration to a more generic structure that can be
used and extended for all per peer connection CryptoOptions that can be on a
given PeerConnection.

Now all SRTP related options are under webrtc::CryptoOptions::Srtp and can be
accessed as crypto_options.srtp.whatever_option_name. This is more inline with
other structures we have in WebRTC such as VideoConfig. As additional features
are added over time this will allow the structure to remain compartmentalized
and concerned components can only request a subset of the overall configuration
structure e.g:

void MySrtpFunction(const webrtc::CryptoOptions::Srtp& srtp_config);

In addition to this it made little sense for sslstreamadapter.h to hold all
Srtp related configuration options. The header has become loo large and takes on
too many responsibilities and spilting this up will lead to more maintainable
code going forward.

This will be used in a future CL to enable configuration options for the newly
supported Frame Crypto.

Change-Id: I99d1be36740c59548c8e62db52d68d738649707f
Bug: webrtc:9681
Reviewed-on: https://webrtc-review.googlesource.com/c/105180
Reviewed-by: Emad Omara <emadomara@webrtc.org>
Reviewed-by: Kári Helgason <kthelgason@webrtc.org>
Reviewed-by: Sami Kalliomäki <sakal@webrtc.org>
Reviewed-by: Qingsi Wang <qingsi@webrtc.org>
Reviewed-by: Steve Anton <steveanton@webrtc.org>
Commit-Queue: Benjamin Wright <benwright@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#25130}
diff --git a/api/peerconnectioninterface.h b/api/peerconnectioninterface.h
index 3d8a9c1..141b2c9 100644
--- a/api/peerconnectioninterface.h
+++ b/api/peerconnectioninterface.h
@@ -77,6 +77,7 @@
 #include "api/audio_codecs/audio_encoder_factory.h"
 #include "api/audio_options.h"
 #include "api/call/callfactoryinterface.h"
+#include "api/crypto/cryptooptions.h"
 #include "api/datachannelinterface.h"
 #include "api/fec_controller.h"
 #include "api/jsep.h"
@@ -1180,7 +1181,7 @@
  public:
   class Options {
    public:
-    Options() : crypto_options(rtc::CryptoOptions::NoGcm()) {}
+    Options() {}
 
     // If set to true, created PeerConnections won't enforce any SRTP
     // requirement, allowing unsecured media. Should only be used for
@@ -1209,7 +1210,7 @@
     rtc::SSLProtocolVersion ssl_max_version = rtc::SSL_PROTOCOL_DTLS_12;
 
     // Sets crypto related options, e.g. enabled cipher suites.
-    rtc::CryptoOptions crypto_options;
+    CryptoOptions crypto_options = CryptoOptions::NoGcm();
   };
 
   // Set the options to be used for subsequently created PeerConnections.