feat: support JSON with MeshAccessLog

[michaelbeaumont]

For TCP we now always embed log lines as JSON messages for the log streamer. It still supports old style log lines for now.

Checklist prior to review

• Link to docs PR or issue --
• Link to UI issue or PR --
• Is the issue worked on linked? -- MeshAccessLog implementation #4979
• The PR does not hardcode values that might break projects that depend on kuma (e.g. "kumahq" as a image registry) --
• The PR will work for both Linux and Windows, system specific functions like syscall.Mkfifo have equivalent implementation on the other OS --
• Unit Tests -- no new ones
• E2E Tests --
• Manual Universal Tests -- none
• Manual Kubernetes Tests --
• Do you need to update UPGRADE.md? --
• Does it need to be backported according to the backporting policy? --
• Do you need to explicitly set a > Changelog: entry here or add a ci/ label to run fewer/more tests?

Changelog: feat(policy): Add MeshAccessLog policy