Add a test of httpcli over ssl

Makefile

build.yaml

src/core/httpcli/httpcli.c

src/core/httpcli/httpcli.h

test/core/httpcli/httpscli_test.c

test/core/httpcli/test_server.py

tools/run_tests/run_tests.py

tools/run_tests/sources_and_headers.json

tools/run_tests/tests.json