* BREAKING CHANGE: urql-svelte v2

* Update packages/svelte-urql/src/subscriptionStore.test.ts
Co-authored-by: Jovi De Croock <decroockjovi@gmail.com>

* chore(urql-svelte): drop placeholderData

* chore(urql-svelte): add requestPolicy input

* chore(urql-svelte): update code comments

* chore(urql-svelte): fix typos

* refactor(urql-svelte): use args interface

similar to react bindings
1. args interface
2. documentNode argument is named "query" for all kinds
3. reduces duplicate code (SSOT)

https://github.com/FormidableLabs/urql/blob/f86763cc565f0c36b948ce9017da0c7c2c302d58/packages/react-urql/src/hooks/useSubscription.ts#L18

* chore: drop unrelated storage update

* fix:(urql-svelte): allow pausing subscription

* chore: rename isPaused to pause

* fix: remove outdated placeholder comments

* Update packages/svelte-urql/src/common.ts
Co-authored-by: Phil Pluckthun <phil@kitten.sh>

* chore: drop common exports
https://github.com/FormidableLabs/urql/pull/2370#discussion_r837941373

* fix: unusbscribe wonka with svelte

https://github.com/FormidableLabs/urql/pull/2370#pullrequestreview-943896034

* chore: clarify wording

https://github.com/FormidableLabs/urql/pull/2370#discussion_r851768603

* feat: restore context helpers

* chore: rename methods to indicate context

* fix: correct typo

* fix: remove typo

* feat: add context to `baseResult.operation`

* refactor: move operation into common

* Refactor: align optimise and align with other bindings

* Add missing subscription handler to mutationStore

* Add changeset

* Remove redundant update from mutationStore

* Update API docs

* Add outdated notice to svelte basics docs
Co-authored-by: Jovi De Croock <decroockjovi@gmail.com>
Co-authored-by: Phil Pluckthun <phil@kitten.sh>