Make token serializing/deserializing async (#8427)

The idea is that in future tokens will encode a mapping of instance to position. However, we don't want to include the full instance name in the string representation, so instead we'll have a mapping between instance name and an immutable integer ID in the DB that we can use instead. We'll then do the lookup when we serialize/deserialize the token (we could alternatively pass around an `Instance` type that includes both the name and ID, but that turns out to be a lot more invasive).

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/8427.misc b/changelog.d/8427.misc
new file mode 100644
index 0000000000..c9656b9112
--- /dev/null
+++ b/changelog.d/8427.misc
@@ -0,0 +1 @@
+Make stream token serializing/deserializing async.