Move the connections implementations to own folders

[LukasWoodtli]

This leads to a cleaner project structure and forms the basis for a more modular project.

[mlasch]

Good idea to move the connection implementations out of the examples directory. I would not put the connection implementations in an "addon" directory. Typically an application (or example) will use one of the connections making it not really an addon. I suggest to put the networking layer in a directory called something like "transport" which would then contain "udp" and "tinydtls".

This to me personally looks much cleaner.

coap
core
...
transport
├── tinydtls
└── udp

[sonarcloud[bot]]

Quality Gate passed

Issues
70 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarCloud