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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

Refactor request execution and use IPLD SkipMe functionality for proper partial results on a request (#70)

* refactor(requestmanager): refactor execution of requests

* feat(graphsync): properly use SkipMe from ipld to complete partial selections

* fix(requestmanager): remove unused function

* feat(deps): upgrade IPLD prime to last before refactor

* refactor(responsemanager): refactor traversal

switch to iterative traversal that is more amenable to interruption

* feat(peerresponsemanager): add bytes sent to peer response sender

Add a return value to SendResponse in peer response sender to return the number of block bytes
transmitted. Note: does not count unsent blocks. Also convert block size measurements to uint64

* feat(responsemanager): add response pausing

add first implementation of response pausing in response manager

* refactor(responsemanager): extract classes to simplify response manager

extract hooks as independant functionality

* test(responsemanager): add tests for block hooks and request hooks

* test(graphsync): add pause/resume integration test

* fix(responsemanager): fix directory misname

requesthooks.go directory -> requesthooks

* fix(tests): cleanup races & lint

* test(graphsync): fix flaky test