add compatibility note about pre-final specifications

[Sakurann]

Multiple non-final specifications are referenced in HAIP. we should add a note about their versions.

Precedent in VP and VCI:

• VP: https://openid.github.io/OpenID4VP/openid-4-verifiable-presentations-wg-draft.html#section-13.4
• VCI: https://openid.github.io/OpenID4VCI/openid-4-verifiable-credential-issuance-wg-draft.html#section-14.7

related issues:
openid/OpenID4VCI#456
openid/OpenID4VP#409

[jogu]

Which specifications are mentioned only in HAIP?

e.g. I'm not sure if HAIP should pin a version of token status list, as VCI already has. Or at least if it does it should be the same version, or they should be normatively equivalent, or we should make clear the version specified in HAIP one takes priority?