Merge changes Ida388b6f,I9ed00a76,I2d37fe56,I81633390,Ia16926b4, ... into main
* changes:
Register reserved offer
Add L2capNetworkSpecifier to blanket offer
Add blanket offer to L2capNetworkProvider
Add empty L2capNetworkProvider
Implement matching semantics for L2capNetworkSpecifier
Do not allow L2CAP specifier with ROLE_SERVER and remote address set
Do not redact PSM from L2capNetworkSpecifier
Use IntRange for setPsm
Improve documentation of L2capNetworkSpecifier
Have setRemoteAddress accept a Nullable remoteAddress