Add timeout=30 to all bare ClientSession, IMAP4_SSL, smtplib.SMTP, and
ws_connect calls that previously had no timeout, preventing indefinite
hangs when an external server is slow or unresponsive.
Adapters hardened:
- HomeAssistant: REST + WS session creation, ws_connect handshake
- Email: all IMAP4_SSL (x2) and smtplib.SMTP (x3) calls
- Mattermost: session creation, _api_get, _api_post, _upload_file (60s)
- SMS: session creation in connect() + fallback session in send()
Salvaged from PRs #3161, #3168, #3170 (memosr) and #3201 (binhnt92).
SMS fallback ClientSession on send() also patched (missed in #3201).
Co-authored-by: memosr <memosr@users.noreply.github.com>
Co-authored-by: nguyen binh <binhnt92@users.noreply.github.com>
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