Use l2cap signaling when LeConnUpdate is not available#411

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HaoboGu wants to merge 3 commits intoembassy-rs:mainfrom

HaoboGu:feat/conn_update

Commits on Jun 18, 2025

feat(l2cap): add LeConnParamUpdateReq types
HaoboGu
committed
feat(host): use L2CAP signaling when conn parameter update procedure is not supported
HaoboGu
committed

Commits on Jun 19, 2025

refactor(host): change `next_request_id` back to private, remove code which won't be implemented now
HaoboGu
committed