database: separate transaction-handling and retry-handling.

Previously call-with-transaction would both retry when SQLITE_BUSY errors were
thrown and do what its name suggested (start and rollback/commit a
transaction).  This changes it to do only what its name implies, which
simplifies its implementation.  Retrying is provided by the new
call-with-SQLITE_BUSY-retrying procedure.

* guix/store/database.scm (call-with-transaction): no longer restarts, new
  #:restartable? argument controls whether "begin" or "begin immediate" is
  used.
  (call-with-SQLITE_BUSY-retrying, call-with-retrying-transaction,
  call-with-retrying-savepoint): new procedures.
  (register-items): use call-with-retrying-transaction to preserve old
  behavior.

* .dir-locals.el (call-with-retrying-transaction,
  call-with-retrying-savepoint): add indentation information.

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