Placeholder issue for MSCs that should land prior to the privacy release

[turt2live]

A number of MSCs are used without the use of a labs flag for the privacy work. We should ensure the MSCs exit FCP before cutting a release, or add a bunch of labs flags, or use unstable endpoints instead of versioned ones.

The MSCs are:

• MSC2230: Store Identity Server in Account Data matrix-org/matrix-spec-proposals#2230
• MSC2229: Allowing 3PID Owners to Rebind matrix-org/matrix-spec-proposals#2229
• MSC2140: Terms of Service for ISes and IMs matrix-org/matrix-spec-proposals#2140
• MSC1961: Integration manager authentication APIs matrix-org/matrix-spec-proposals#1961
• MSC1957: Integration manager discovery matrix-org/matrix-spec-proposals#1957
• MSC2134: Identity Hash Lookups matrix-org/matrix-spec-proposals#2134

[richvdh]

I'm ticking the ones that have entered FCP and crossing out the ones that have exited

[jryans]

Removed MSC2233 as we're going to instead use /versions.

[turt2live]

All MSCs are now in FCP - waiting for merges now.

[turt2live]

They've all landed now