Shared memory data transfer between Functions host and out-of-proc workers for HTTP body

#### What problem would the feature you're requesting solve? Please describe.
Invocations with large HTTP body is sent to the worker over gRPC which can be slow.

#### Describe the solution you'd like
Once the shared memory data transfer v1 (#6792) is complete, we can extend that to also transfer large HTTP body over shared memory instead of gRPC.

#### Describe alternatives you've considered
n/a

#### Additional context
n/a