firestore 0.61.1

Library provides a simple API for Google Firestore and own Serde serializer based on efficient gRPC API
Documentation 
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# Select aggregate functions

The library supports the aggregation functions for the queries:

```rust,no_run
# use firestore::*;
# use serde::{Deserialize, Serialize};
# #[derive(Debug, Clone, Deserialize, Serialize)]
# struct MyAggTestStructure { counter: usize }
# const TEST_COLLECTION_NAME: &str = "test";
# async fn example(db: FirestoreDb) -> Result<(), Box<dyn std::error::Error + Send + Sync>> {
let objs: Vec<MyAggTestStructure> = db
    .fluent()
    .select()
    .from(TEST_COLLECTION_NAME)
    .aggregate(|a| a.fields([a.field(path!(MyAggTestStructure::counter)).count()]))
    .obj()
    .query()
    .await?;
# let _ = objs;
# Ok(())
# }
```