Upgrade to v0.28

In v0.28, we introduced Query Based Metadata. Users can query cached metadata with ObjectMetakey to make sure that OpenDAL always makes the best decision.

- pub async fn metadata(&self) -> Result<ObjectMetadata>;
+ pub async fn metadata(
+        &self,
+        flags: impl Into<FlagSet<ObjectMetakey>>,
+    ) -> Result<Arc<ObjectMetadata>>;

Please visit Object::metadata()'s example for more details.

What's Changed

• feat: add dashmap support by @PsiACE in #1390
• RFC-1391: Object Metadataer by @Xuanwo in #1391
• refactor: Implement query based object metadata cache by @Xuanwo in #1395
• refactor: Store complete inside bits and add more examples by @Xuanwo in #1397
• RFC-1398: Query Based Metadata by @Xuanwo in #1398
• refactor: Trigger panic if users try to visit not fetched metadata by @Xuanwo in #1399
• refactor: Polish the implement of Query Based Metadata Cache by @Xuanwo in #1400
• Bump version to 0.28 by @Xuanwo in #1401

Full Changelog: v0.27.2...v0.28.0