enhanced reporting for nih

- can NIH check on the website what changes were made between date X and now for a given dandiset. i had been doing this manually. perhaps we can run this as a task on our server.
- for bids datasets they also wanted breakdowns that i have been generating manually

```
here is the participant summary:

sub-EXC022 {ses-MRI}
sub-I38 {ses-OCT, ses-MRI}
sub-I41 {ses-MRI}
sub-I46 {ses-SPIM, ses-OCT, ses-MRI}
sub-I48 {ses-SPIM, ses-OCT, ses-MRI}
sub-I52 {ses-MRI}
sub-I53 {ses-MRI}
sub-I55 {ses-OCT, ses-MRI}
sub-I56 {ses-OCT, ses-MRI}
sub-I59 {ses-MRI}
sub-I60 {ses-MRI}
sub-KC001 {ses-MRI}

and session summary:
ses-MRI 12
ses-OCT 5
ses-SPIM 2

and the sample summary (for spim)
sub-I46 31 (broca's area and motor cortex)
sub-I48 48 (broca's area)

and stereology summary
sub-I46 {stain-NeuN, stain-Calretinin}
```