Changes to List Observations

changed the pattern of the query request parameter source from ^[a-zA-Z0-9 _.-]+$ to ^[a-zA-Z0-9 _./-]+$

the observations/items/source response's property pattern was changed from ^[a-zA-Z0-9 _.-]+$ to ^[a-zA-Z0-9 _./-]+$ for the status 200

the response property observations/items/content became optional for the status 200

the response property observations/items/occurredAt became optional for the status 200

the response property observations/items/source became optional for the status 200

the code response property's max was increased from 99999.00 to 999999.00 for the response status 400

the code response property's max was increased from 99999.00 to 999999.00 for the response status 401

the code response property's max was increased from 99999.00 to 999999.00 for the response status 403

the code response property's max was increased from 99999.00 to 999999.00 for the response status 404

the code response property's max was increased from 99999.00 to 999999.00 for the response status 429

the code response property's max was increased from 99999.00 to 999999.00 for the response status 500

the code response property's max was increased from 99999.00 to 999999.00 for the response status 503

added the new optional query request parameter conversationId

for the query request parameter pageToken, the maxLength was increased from 500 to 4096