Update the ADR-38 to address no file based streaming.

[robert-zaremba]

Summary

Structures outlined in ADR-38 miss non-file based streaming support.

Problem Definition

In current version of ADR-38 we assume that each transaction is encoded in a separate file. This makes it possible to decode the transaction. However, in a service to service streaming we need clarify transaction bounds.

Proposal

Define a structure (probably a trivial one) to support wire streaming.

CC: @i-norden

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[tac0turtle]

we updated the adr from when it was written closing this as its not applicable.

We support both file based streaming and wire through hashicorp plugins