docs: add story for picker nested values

[Mnickii]

Closes #2960

PR Type

Documentation content changes

Description of the changes

Adds a story for key-name nested values in mgt-picker

PR checklist

• Project builds (yarn build) and changes have been tested in at least two supported browsers (Edge + non-Chromium based browser)
• All public APIs (classes, methods, etc) have been documented following the jsdoc syntax
• Stories have been added and existing stories have been tested
• Added appropriate documentation. Docs PR:

• License header has been added to all new source files (yarn setLicense)
• Contains NO breaking changes

Other information

[github-actions]

📖 The updated storybook is available here

[github-actions]

📖 The updated storybook is available here

[github-actions]

Package	Line Rate	Branch Rate	Complexity	Health
mgt-components.src.components	85%	67%	0	✔
mgt-components.src.components.mgt-contact	63%	100%	0	➖
mgt-components.src.components.mgt-file	62%	100%	0	➖
mgt-components.src.components.mgt-file-list	46%	100%	0	❌
mgt-components.src.components.mgt-file-list.mgt-file-upload	49%	86%	0	❌
mgt-components.src.components.mgt-get	22%	100%	0	❌
mgt-components.src.components.mgt-messages	68%	100%	0	➖
mgt-components.src.components.mgt-organization	47%	100%	0	❌
mgt-components.src.components.mgt-person	78%	65%	0	✔
mgt-components.src.components.mgt-person-card	50%	65%	0	❌
mgt-components.src.components.mgt-picker	80%	100%	0	✔
mgt-components.src.components.mgt-profile	40%	100%	0	❌
mgt-components.src.components.mgt-tasks-base	87%	100%	0	✔
mgt-components.src.components.mgt-theme-toggle	100%	100%	0	✔
mgt-components.src.components.mgt-todo	79%	100%	0	✔
mgt-components.src.components.sub-components.mgt-flyout	72%	53%	0	➖
mgt-components.src.components.sub-components.mgt-spinner	100%	100%	0	✔
mgt-components.src.graph	38%	86%	0	❌
mgt-components.src.styles	92%	80%	0	✔
mgt-components.src.utils	78%	11%	0	✔
mgt-element.dist.es6.components.src.components	72%	73%	0	➖
mgt-element.dist.es6.mock.src.mock	90%	72%	0	✔
mgt-element.dist.es6.providers.src.providers	83%	66%	0	✔
mgt-element.dist.es6.src	90%	100%	0	✔
mgt-element.dist.es6.utils.src.utils	63%	72%	0	➖
mgt-element.src	93%	40%	0	✔
mgt-element.src.components	78%	100%	0	✔
mgt-element.src.mock	81%	56%	0	✔
mgt-element.src.providers	83%	91%	0	✔
mgt-element.src.utils	71%	90%	0	➖
Summary	64% (13724 / 21438)	64% (376 / 588)	0	➖

[github-actions]

📖 The updated storybook is available here