collab: Use StripeClient to retrieve prices and meters from Stripe (#31624)

This PR updates `StripeBilling` to use the `StripeClient` trait to
retrieve prices and meters from Stripe instead of using the
`stripe::Client` directly.

Release Notes:

- N/A

crates/collab/src/stripe_client.rs

@@ -10,8 +10,9 @@ use async_trait::async_trait;
 #[cfg(test)]
 pub use fake_stripe_client::*;
 pub use real_stripe_client::*;
+use serde::Deserialize;
 
-#[derive(Debug, PartialEq, Eq, Hash, Clone)]
+#[derive(Debug, PartialEq, Eq, Hash, Clone, derive_more::Display)]
 pub struct StripeCustomerId(pub Arc<str>);
 
 #[derive(Debug, Clone)]
@@ -25,9 +26,38 @@ pub struct CreateCustomerParams<'a> {
     pub email: Option<&'a str>,
 }
 
+#[derive(Debug, PartialEq, Eq, Hash, Clone, derive_more::Display)]
+pub struct StripePriceId(pub Arc<str>);
+
+#[derive(Debug, Clone)]
+pub struct StripePrice {
+    pub id: StripePriceId,
+    pub unit_amount: Option<i64>,
+    pub lookup_key: Option<String>,
+    pub recurring: Option<StripePriceRecurring>,
+}
+
+#[derive(Debug, Clone)]
+pub struct StripePriceRecurring {
+    pub meter: Option<String>,
+}
+
+#[derive(Debug, PartialEq, Eq, Hash, Clone, derive_more::Display, Deserialize)]
+pub struct StripeMeterId(pub Arc<str>);
+
+#[derive(Debug, Clone, Deserialize)]
+pub struct StripeMeter {
+    pub id: StripeMeterId,
+    pub event_name: String,
+}
+
 #[async_trait]
 pub trait StripeClient: Send + Sync {
     async fn list_customers_by_email(&self, email: &str) -> Result<Vec<StripeCustomer>>;
 
     async fn create_customer(&self, params: CreateCustomerParams<'_>) -> Result<StripeCustomer>;
+
+    async fn list_prices(&self) -> Result<Vec<StripePrice>>;
+
+    async fn list_meters(&self) -> Result<Vec<StripeMeter>>;
 }