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Evaluates a placeholder expression using the given context.

Normally the resolved value will be used as command line flags in strings. This function does not automatically perform the string conversion, i.e., the return type is the same as the type of the value originally has. Currently it can be exec property supported primitive types: int, float, string. if use proto operator: serilaized proto message, or proto primitive fields. The caller needs to perform desired string conversions.

expression A placeholder expression to be resolved.
context Information needed to resolve the expression.

Resolved expression value.