Frictionless

- Implemented schema actions:
- `Schema.describe` (will replace `describe_schema` in v5)
- `schema.validate` (will replace `validate_schema` in v5)
- Implemented new transform steps:
- `steps.field_merge`
- `steps.field_pack`

- Implemented package actions:
- `Package.describe` (will replace `describe_package` in v5)
- `package.extract` (will replace `extract_package` in v5)
- `package.validate` (will replace `validate_package` in v5)
- `package.transform` (will replace `transform_package` in v5)

- Implemented resource actions:
- `Resource.describe` (will replace `describe_resource` in v5)
- `resource.extract` (will replace `extract_resource` in v5)
- `resource.validate` (will replace `validate_resource` in v5)
- `resource.transform` (will replace `transform_resource` in v5)

- Added to_markdown() feature to metadata (1052)

- Added a feature that allows to export table schema as excel (1040)
- Added nontabular note to validation results to indicate nontabular file (1046)
- Excel stats now shows bytes and hash (1045)
- Added pprint feature which displays metadata in a readable and pretty way (1039)
- Improved error message if resource.data is not a string (1036)

- Made Detector's private properties public and writable (1025)