Update LiveObjects docs for aggregate limits and notification mode

[zknill]

• Clarify that the 6.5 MB object size limit is an aggregate across all objects on a channel, with no limit on object count
• Document the 64 KiB per-operation size constraint and that objects can grow beyond it via incremental updates
• Note that large objects may be split across multiple sync messages, affecting billing message counts
• Add documentation for the new 'notification' inband objects mode, which sends a REST API link instead of streaming full state
• Restructure inband-objects.mdx into 'objects mode' and 'notification mode' sections
• Fix limits.mdx description to say "aggregate size of all objects"

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[mschristensen]

LGTM, although I'll leave @kaschula to review the inband objects changes

[kaschula]

Inband side looks good. I have an open PR with some inband changes which contains a few more details interms of examples and expected response formats. Go ahead and merge this I will rebase mine and add any extra bits.