support passing serialized context to benchmark

Registered by Marco Morais

The use cases and proposed design of the feature are described in this google doc https://docs.google.com/document/d/16hp6K37C8_j7VQcUGq0oGJ_2dLV4Hlul_IyYpouE-tE/edit#

Blueprint information

Status:
Not started
Approver:
Boris Pavlovic
Priority:
High
Drafter:
Marco Morais
Direction:
Needs approval
Assignee:
Marco Morais
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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