feat: support for rfc7692 message deflate in transport_ws (IDFGH-13987)

[ariken74]

Description

Adds support for querying rsv1 flag of websocket header. Needed to implement per message deflate as RFC7692.

https://datatracker.ietf.org/doc/html/rfc7692#section-9.2

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Warnings

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Some issues found for the commit messages in this PR: the commit message "support for rfc7692 message deflate": summary looks empty type/action looks empty Please fix these commit messages - here are some basic tips: follow Conventional Commits style correct format of commit message should be: <type/action>(<scope/component>): <summary>, for example fix(esp32): Fixed startup timeout issue allowed types are: change,ci,docs,feat,fix,refactor,remove,revert,test sufficiently descriptive message summary should be between 20 to 72 characters and start with upper case letter avoid Jira references in commit messages (unavailable/irrelevant for our customers) TIP: Install pre-commit hooks and run this check when committing (uses the Conventional Precommit Linter).

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