release 16.0.0 (#453)

# Release Notes
- fix: add some backoff for picking `latest_query_block` (#445)
- fix: use TAP as the name in the receipt EIP-712 domain (#451)
- feat: chain aliases & partially-supported chains (#450)
- fix: retain indexing statuses (#456)
- fix(budget): target fees per client request (#452)
- fix: default free subscription tier (#457)
- fix: limit indexing status requests by active allocations (#460)
## Config Changes
- The `name` field of `chains` has been replaced with `names`, to
support multiple aliases for the same indexed chain.