[CoCo AS]: Documentation for parsed-claim measurement

[Xynnn007]

Currently CoCo-AS will generate a parsed_claims key-value map due different platforms. For example on TDX we might have the following

{
    "tdx.ccel.kernel": "5b7aa6572f649714ff00b6a2b9170516a068fd1a0ba72aa8de27574131d454e6396d3bfa1727d9baf421618a942977fa",
    "tdx.ccel.kernel_parameters.console": "hvc0",
    "tdx.ccel.kernel_parameters.root": "/dev/vda1",
    "tdx.ccel.kernel_parameters.rw": null,
    "tdx.quote.header.version": "0400",
    "tdx.quote.header.att_key_type": "0200",
    "tdx.quote.header.tee_type": "81000000",
    "tdx.quote.header.reserved": "00000000",
    "tdx.quote.header.vendor_id": "939a7233f79c4ca9940a0db3957f0607",
    "tdx.quote.header.user_data": "d099bfec0a477aa85a605dceabf2b10800000000",
    "tdx.quote.body.mr_config_id": "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "tdx.quote.body.mr_owner": "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "tdx.quote.body.mr_owner_config": "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "tdx.quote.body.mr_td": "705ee9381b8633a9fbe532b52345e8433343d2868959f57889d84ca377c395b689cac1599ccea1b7d420483a9ce5f031",
    "tdx.quote.body.mrsigner_seam": "000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
    "tdx.quote.body.report_data": "7c71fe2c86eff65a7cf8dbc22b3275689fd0464a267baced1bf94fc1324656aeb755da3d44d098c0c87382f3a5f85b45c8a28fee1d3bdb38342bf96671501429",
    "tdx.quote.body.seam_attributes": "0000000000000000",
    "tdx.quote.body.td_attributes": "0100001000000000",
    "tdx.quote.body.mr_seam": "2fd279c16164a93dd5bf373d834328d46008c2b693af9ebb865b08b2ced320c9a89b4869a9fab60fbe9d0c5a5363c656",
    "tdx.quote.body.tcb_svn": "03000500000000000000000000000000",
    "tdx.quote.body.xfam": "e742060000000000"
}

It would be useful to have a document the claim items of different platforms, which can help to write OPA policy and prepare reference values.