Resolve #2765065: "Bundle plurals"

Closes #2765065

added 1 commit

• 29a34a59 - Fix failing tests.

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added 1 commit

• ad601b5d - Added nullable return types.

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added 7 commits

• fc9309f9 - Provide documentation.
• 869ffcc2 - Strict typing.
• a71b8f93 - Improve documentation.
• e6d01a35 - Drop the fallback layer.
• f6a7c7ce - Add singular, plural, count labels from bundle entities in bundle info.
• 6150c383 - Remove the label fallback test.
• 1b1622b3 - Move ::getCountLabel() in EntityTypeBundleInfoInterface as ::getBundleCountLabel().

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added 5 commits

• 20f846fd - Modernize the post update script.
• 3332da77 - Modernize the post update script.
• e39a423a - Replace getters with setters.
• 9c497b75 - The variant should not be optional.
• 287528f3 - Provide test coverage.

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resolved all threads

added 1 commit

• de1de062 - Fix coding standards.

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added 2 commits

• 54e7875f - Fix entity.api.php examples.
• 9ac1ba8a - Add translation context.

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added 1 commit

• e3fb9d07 - Add back the bundle entity getters.

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added 1 commit

• bd86400d - Remove demo test from #2765065-124.

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