feat: network payload capture draft 2

[pauldambra]

requires: PostHog/posthog-js#902

• We don't want to support running posthog/network and rrweb/network plugin at the same time. These changes support that change
• improve timeline display
• allow raw json view for debugging

### timeline view showing item was loaded from cache

[github-actions]

Size Change: -1.5 kB (0%)

Total Size: 1.97 MB

Filename	Size	Change
frontend/dist/toolbar.js	1.97 MB	-1.5 kB (0%)

_{compressed-size-action}

[posthog-bot]

📸 UI snapshots have been updated

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• webkit: 0 added, 0 modified, 0 deleted

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[posthog-bot]

📸 UI snapshots have been updated

1 snapshot changes in total. 0 added, 1 modified, 0 deleted:

• chromium: 0 added, 1 modified, 0 deleted (diff for shard 2)
• webkit: 0 added, 0 modified, 0 deleted

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[posthog-bot]

📸 UI snapshots have been updated

1 snapshot changes in total. 0 added, 1 modified, 0 deleted:

• chromium: 0 added, 1 modified, 0 deleted (diff for shard 2)
• webkit: 0 added, 0 modified, 0 deleted

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[posthog-bot]

📸 UI snapshots have been updated

1 snapshot changes in total. 0 added, 1 modified, 0 deleted:

• chromium: 0 added, 1 modified, 0 deleted (diff for shard 1)
• webkit: 0 added, 0 modified, 0 deleted

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