connector/linkedinfmt: sort attributes before formatting and use codepoints

pkg/connector/capabilities.go

pkg/connector/linkedinfmt/attributedtext/example1.json

pkg/connector/linkedinfmt/attributedtext/example1_msg.json

pkg/connector/linkedinfmt/attributedtext_parse_test.go

pkg/connector/linkedinfmt/convert.go

pkg/connector/linkedinfmt/html.go

pkg/connector/matrixfmt/convert.go

pkg/connector/matrixfmt/html.go