Add manifests metadata table

[geruh]

This PR adds the manifests metadata table the existing inspect logic for Iceberg tables as listed in #511. The manifests metadata table in Iceberg shows the current file manifests for a given table.

Java implementation: https://github.com/apache/iceberg/blob/main/core/src/main/java/org/apache/iceberg/ManifestsTable.java

Usage

table.inspect.manifests() 

pyarrow.Table content: int8 not null path: string not null length: int64 not null partition_spec_id: int32 not null added_snapshot_id: int64 not null added_data_files_count: int32 not null existing_data_files_count: int32 not null deleted_data_files_count: int32 not null added_delete_files_count: int32 not null existing_delete_files_count: int32 not null deleted_delete_files_count: int32 not null partition_summaries: list<item: struct<contains_null: bool not null, contains_nan: bool, lower_bound: string, upper_bound: string>> not null child 0, item: struct<contains_null: bool not null, contains_nan: bool, lower_bound: string, upper_bound: string> child 0, contains_null: bool not null child 1, contains_nan: bool child 2, lower_bound: string child 3, upper_bound: string ---- content: [[0]] path: [["s3://warehouse/default/table_metadata_manifests/metadata/3bf5b4c6-a7a4-4b43-a6ce-ca2b4887945a-m0.avro"]] length: [[6886]] partition_spec_id: [[0]] added_snapshot_id: [[3815834705531553721]] added_data_files_count: [[1]] existing_data_files_count: [[0]] deleted_data_files_count: [[0]] added_delete_files_count: [[0]] existing_delete_files_count: [[0]] deleted_delete_files_count: [[0]] partition_summaries: [[ -- is_valid: all not null -- child 0 type: bool [false] -- child 1 type: bool [false] -- child 2 type: string ["test"] -- child 3 type: string ["test"]]] 

[HonahX]

LGTM! Thanks for adding this @geruh

[Fokko]

This looks great @geruh, thanks for working on this. I know quite a few folks are waiting for this. Thanks @HonahX for the review 👍