[FEATURE REQ] Implement query by example in spring-data-cosmos

**Is your feature request related to a problem? Please describe.**
[Query by example](https://docs.spring.io/spring-data/jpa/reference/repositories/query-by-example.html) API drastically reduces the code needed to implement dynamic searches in spring data.

**Describe the solution you'd like**
SimpleCosmosRepository and SimpleReactiveCosmosRepository should implement the QueryByExampleExecutor and the ReactiveQueryByExampleExecutor interfaces respectively. And the implementations should follow [SimpleJpaRepository](https://github.com/spring-projects/spring-data-jpa/blob/main/spring-data-jpa/src/main/java/org/springframework/data/jpa/repository/support/SimpleJpaRepository.java) and [SimpleMongoRepository](https://github.com/spring-projects/spring-data-mongodb/blob/main/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/repository/support/SimpleMongoRepository.java) implementations from spring-data-jpa and spring-data-mongo as references

**Describe alternatives you've considered**
Currently the only way to implement search queries in spring-data-cosmos is to implement named queries or custom queries in the spring repositories which requires to consider when writing the code to establish all the possible parameters combinations and the adding to the code ways to handle the possible null values of the query.
This is directly addressed by the query by example API.

**Additional context**
I have created a [draft PR](https://github.com/Azure/azure-sdk-for-java/pull/45918) with a possible solution for this which I am still fully testing but would much appreciate any feedback about it.

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