feat: Introduct single object to cart entry layers

[znikola]

This PR introduces a new extensibility mechanism to the base cart's addEntry(), removeEntry() and updateEntry() methods across all layers:

• abstract adapter
• occ adapter
• connector
• facade
• facade implemetnation
• cart entry actions and effect

The old method signatures are deprecated and will be removed in the future major release.

closes CXSPA-1032

[cypress[bot]]

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Test summary

3 • 0 • 0 • 0 • 3

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Run details

Project	spartacus
Status	Passed
Commit	03930635a6 ℹ️
Started	Sep 8, 2022 11:28 AM
Ended	Sep 8, 2022 11:31 AM
Duration	02:45 💡
OS	Linux Ubuntu - 20.04
Browser	Electron 91

View run in Cypress Dashboard ➡️

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Flakiness

	cypress/integration/ssr/pages.core-e2e-spec.ts		3
1	SSR > should render homepage
2	SSR > should render PLP
3	SSR > should render PDP

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