tests: add websockets tests

- add websockets support to sws
- 2300: first very basic websockets test
- 2301: first libcurl test for ws (not working yet)
- 2302: use the ws ca

tests: add websockets tests

- add websockets support to sws
- 2300: first very basic websockets test
- 2301: first libcurl test for ws (not working yet)
- 2302: use the ws callback
- 2303: test refused upgrade

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