Support multi extension codecs for AsExecutionPlan trait

[lewiszlw]

Which issue does this PR close?

Closes #.

Rationale for this change

Execution plan tree might have different node from different crates, for example ShuffleWriterExec from datafusion-ballista and DeltaScan from deltalake, these crates both provide PhysicalExtensionCodec.

ShuffleWriterExec
    ProjectionExec
       ...
          DeltaScan

We should be able to serialize/deserialize this case.

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

[alamb]

Rather than changing the API, I wonder if we could instead provide an example of how to make your own composeable codec

Something like

/// A PhysicalExtensionCodec that tries one of multiple inner codecs 
/// until one works
struct ComposedCodec {
  codecs: Vec<Arc<dyn PhysicalExtensionCodec>>
}

impl PhysicalExtensionCodec for ComposedCodec
    // Required methods
    fn try_decode(
        &self,
        buf: &[u8],
        inputs: &[Arc<dyn ExecutionPlan>],
        registry: &dyn FunctionRegistry,
    ) -> Result<Arc<dyn ExecutionPlan>> {
      let mut last_e = None;
      for codec in self.codecs.iter() {
       match codec.try_decode(buf, inputs, registry) {
         Ok(plan) => return Ok(plan),
        // remember error
         Err(e) => last_e = Some(e),
       }
     return Err(last_e.unwrap())  
    }
...
}

[lewiszlw]

Looks great. I'll give it a try later.

[alamb]

Marking as draft as I don't think this PR is waiting on more feedback and I am trying to clear out the remaining reviews

[lewiszlw]

Closed in favor of #11095.