Fix message name casing in SamplingRate proto definition

Standardize the naming convention by changing `GetSamplingRateByIDRequest`
to `GetSamplingRateByIdRequest`, using "Id" instead of "ID" for consistency
with other proto message names across the codebase. Updated the corresponding
handler to reference the corrected message name.

This aligns with the established naming pattern and improves code consistency
following the same convention applied in other proto definitions.

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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/main/proto/samplingrate.proto

@@ -24,7 +24,7 @@ message GetSamplingRatesResponse{
   repeated SamplingRate samplingrates = 1;
 }
 
-message GetSamplingRateByIDRequest{
+message GetSamplingRateByIdRequest{
   int32 id =1;
 }