[ntuple] store streamer info of unsplit fields

[jblomer]

Follow-up of #14728

Stores the streamer info records seen during serialization of unsplit fields in the extra type information of the extension header. To this end, proper serialization and deserialization of the extra type information frame in the header / extension header is implemented.

This will be accompanied by a roottest PR (TODO)

[github-actions[bot]]

Test Results

    12 files      12 suites   2d 20h 23m 48s :stopwatch:  2 642 tests  2 641 :white_check_mark: 0 :zzz: 1 :x: 29 977 runs  29 976 :white_check_mark: 0 :zzz: 1 :x:

For more details on these failures, see this check.

Results for commit 3266abb4.

:recycle: This comment has been updated with latest results.