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* feat(responsemanager): dedup-by-key extension

add deduping requests by a given key to the response manager

* feat(requestmanager): use dedup extension

use dedup extension to not dedup data across stores

* style(imports): fix import formatting

Fix import formatting via script. Also add script for import fixes and release log

* docs(CHANGELOG): add changelog, contributing

Add the changelog and a contributing guidelines doc

This reverts commit 31cc0d5e.

Needs further exploration

* feat(hooks): add extensions on complete

add the ability to send extensions with a final message

* refactor(hooks): complete listener->hook rename

All changes to date including pause requests & start paused, along with new adds for cleanups and checking of execution (#75)

* WIP

* feat(graphsync): pause/unpause requests

Allow graphsync requests to be paused and unpaused via request cancelling and DoNotSendCIDs
extension

* fix(requestmanager): refactor executor

remove extraneous allocation of closure functions

* feat(graphsync): support external request pauses

allow pausing requests imperatively via PauseRequest function

* fix(lint): fix lint errors

* feat(responsemanager): start requests paused

add the ability for a hook to pause a response right when it's first received

* feat(responsemanager): improve cancellation UX

provide a mechanism for responders to learn a requestor cancelled a request and for requestors to
learn a request was cancelled

* feat(requestmanager): process request cancelled status

process the responder returning a request cancelled error code and also support sentinel errors

* feat(executor): refactor to remove loader

remove loader, also only fire restart request as needed

* fix(asyncloader): load requests synchronously when possible

* fix(responsemanager): fix external pause

Fix external pauses missing a block

* fix(responsemanager): do not delay complete listener

Run complete listener in same thread as response processing, making it less susceptable to
interruption via cancel

* fix(responsemanager): fix context check

fix checking for context cancellation errors based off of the way ipld-prime does not wrap errors

* fix(responsemanager): more precise cancel

make cancels only get recorded if actual blocks are not sent -- otherwise the request is considered
complete -- and the complete hook always runs

* fix(requestmanager): handle non processed pauses

Handler the case where a pause is requested but never actually takes place

* refactor(responsemanager): handle cancels, correctly this time

Properly handle cancels for both paused and unpaused states

* fix(errors): remove regex cause it appears to be very slow

* fix(traverser): fix race condition for shutdown

make sure that the traverser is finished in the request executor

* fix(deps): mod tidy

* fix(executor): add back network error

* feat(responsemanager): add ability to pause response outside of a hook

Add the ability for anyone who knows a requestID & peer to pause a response at any time

* feat(responsemanager): add direct cancellations

add function to directly cancel responses from requestID. also, move query execution code to
seperate struct, internal for now

* fix(responsemanager): minor heap allocation optimization

* feat(responsemanager): support extensions on resume

Support sending extensions when resuming a request

* fix(lint): fix lint errors