Summary

Backport of #4046 to the 1.2.lts branch.

Adds GET /out-of-band/records endpoint to query OobRecord entries with pagination and filtering support. This addresses the lack of any way to discover or list existing OOB records in the wallet.

• Supports filtering by state, role, connection_id, and invi_msg_id
• Standard pagination parameters (limit, offset)
• Includes 4 new unit tests

Note: The 1.2.lts branch uses get_limit_offset (limit/offset only) rather than get_paginated_query_params (which adds order_by/descending on main and 1.3.lts). Additionally, state and role are placed in post_filter rather than tag_filter since OobRecord.TAG_NAMES does not include state on this branch.

Closes #4044

Test plan

• All 13 OOB route tests pass locally (4 new + 9 existing)
• CI passes

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