AsyncAPI 2.5.0 - binding shapes are now dependent on binding version

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This means that binding objects shouldn't have static setters and getters (this aligns with AsyncAPI parser behavior) and they support in language server should be conditional depending on binding version.

• Static getters and setters
• conditional language service support

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Static getters and setters have been provided.

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Conditional completion and linting works. COnditional documentation rendering is currently not supported, so we're displaying only last version of the binding.