Added changelog for partner SDK

CHANGELOG.md

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+#### June 2024
+
+-----------
+**ConfigurationForm Changes**
+- We added options to provide default value and placeholder for the Field.
+- We Introduced FieldSet support, which allows to group the Fields and add visibility condition to control displaying on the form.
+- The FormField format is updated to support FieldSet. The single attribute should be used to assign the regular fields.
+
+**SourceConnector Changes**
+- We removed `LogEntry` from Update operation. Now, partners can use `STD::OUT` to send logs. For more details, please refer to [this](https://github.com/fivetran/fivetran_sdk/blob/main/development-guide.md#logging).
+- We have renamed the few enums and services:
+  - Renamed the service definition from `Connector` to `SourceConnector`.
+  - Renamed the `OpType` field to `RecordType`.
+- Added support for `NAIVE_TIME` datatype. Partners can now send data with this datatype.
+
+**DestinationConnector Changes**
+- Added `NAIVE_TIME` data type support.
+- We have renamed the service definition from `Destination` to `DestinationConnector`.
+- A new rpc method `Capabilities` is introduced. This brings the functionalities:
+    - Adjust column types: Supports adjusting Partner data type for each Fivetran type.
+    - Define the max value supported for the columns types.
+    - We have added support for providing parquet batch files. Now, partner can choose the file type to create batch files.
+    - Introduced a new field `supports_history_mode`, which indicates whether the destination supports history mode.
+- Changes in AlterTableRequest:
+    - Takes `table_name` instead of `Table`
+    - Introduced SchemaDiff field, which supports adding new columns, change column type, and update primary keys.  
+- Changes in WriteBatchRequest:
+  - We have added support for parquet batch files configuration details.
+  - Introduced new field `HistoryMode`, which indicates history mode is enabled for table.