Implement the delete-history Command

[alexanderkiel]

We only like to delete the whole history (except for the current version). So we will implement:

DELETE /:type/:id/_history

Current draft FHIR spec: https://build.fhir.org/http.html#delete-history

Docs: https://github.com/samply/blaze/blob/main/docs/api.md#delete-history

We have to do:

• we will add a delete-history transaction command
• add a new entry to the ResourceAsOf index with the t of the new transaction and the identical value except for num-changes set to 1
  • for this we will use d/resource-handle to determine the current value (hash, num-changes and op)
  • if num-changes is already 1 or the resource handle isn't found at all, we will do nothing
  • index entries are build in blaze.db.impl.index.rts-as-of
• override all history entries in the TypeAsOf and SystemAsOf indices with the t of the new transaction appended to the value
  • this t value is called purged-at
  • we will use d/instance-history to get all resource handles but drop the first one
  • the purged-at value means that the particular history entry was purged at this point in time
• we have to decrement the num-changes of TypeStats and SystemStats with the amount the deleted history entries
  • this amount will be the difference of num-changes of the resource handle found minus 1
  • if the difference is zero, we won't write new stats index entries
• for the search parameter indices, there entries will be deleted by Implement Index Garbage Collection #1505
• d/instance-history will just stop outputting resource handles if num-changes is 1
• d/type-history and d/system-history will not output a resource handle if it's purged-at value is less or equal the t of the current database state
• for the read interaction we have to decide wether we like to implement the difference on database layer or interaction layer
• we need also a new interaction delete-history which will be called on DELETE on the history endpoint
• we need a new route in blaze.rest-api.routes
• remove all resource content from the resource store by content hash, except the newest one

This issue is part of the Epic: #399