Is your feature request related to a problem?

Similar to null-safe member accesses, we might want to call an expression if it is not null and return null otherwise.

Desired solution

• Syntax: a?[]
• Move isNullSafe from SdsMemberAccess to SdsChainedExpression
• Apply the current checks involving isNullSafe to all SdsChainedExpression

Possible alternatives (optional)

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Additional Context (optional)

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