rename kornia-core to kornia-tensor

[edgarriba]

This pull request includes significant changes to the kornia project, particularly focusing on renaming and restructuring core components. The most important changes involve renaming the kornia-core and kornia-core-ops crates to kornia-tensor and kornia-tensor-ops, respectively, and updating dependencies and imports accordingly.

Renaming and restructuring:

• Cargo.toml: Updated workspace members to use wildcard notation for crates and added kornia-tensor and kornia-tensor-ops while removing kornia-core and kornia-core-ops. [1] [2]
• Renamed crates/kornia-core to crates/kornia-tensor and updated the package name in Cargo.toml.
• Renamed crates/kornia-core-ops to crates/kornia-tensor-ops and updated the package name in Cargo.toml. [1] [2]

Dependency and import updates:

• Updated dependencies in various Cargo.toml files to replace kornia-core with kornia-tensor. [1] [2] [3]
• Updated imports in source files to replace kornia-core with kornia-tensor. [1] [2] [3] [4] [5] [6] [7]

Error handling and test updates:

• Updated error handling in crates/kornia-image/src/error.rs to use kornia_tensor::TensorError instead of kornia_core::TensorError.
• Updated tests in various source files to use kornia_tensor instead of kornia_core. [1] [2]