[FC-0118] docs: ADR for normalizing nested json apis

[taimoor-ahmed-1]

Description

Adds ADR-0036 documenting the strategy for reducing deeply nested JSON payloads across Open edX APIs.

Some endpoints (course block trees, OLX structure, progress views) return large, deeply nested responses that are expensive to parse for both human clients and automated agents. This ADR establishes:

?view=minimal / ?fields=... query params as the standard convention for requesting a stripped-down representation of complex resources
Prefer IDs + follow-up endpoints over embedding entire sub-trees inline (e.g. return block IDs in a list response, fetch full block data via a detail endpoint)
Document all response variants (minimal vs. full) in OpenAPI schemas

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