Introduce new global header files

[cepetr]

This large PR focuses on cleaning up code structure and organization.

It introduces well-defined global headers that simplify includes, make the code tidier, and establish a system to prevent unnecessary dependencies in API headers.

• trezor_types.h: Defines commonly used types like uint8_t, uint32_t, bool, and secbool. This header is primarily intended for interface headers, consolidating all common types and replacing direct includes of stdint.h, stdbool.h, and secbool.h.

• trezor_rtl.h: Provides declarations for commonly used functions (e.g., memset, memcpy, strcmp, strcpy). It should be included only in implementation files (.c files), replacing direct includes of assert.h, stdio.h, string.h, and error_handling.h. This header should not be included in API headers.

• trezor_bsp.h: Contains board-specific definitions (e.g., pin mappings) and STM32 HAL headers, replacing the direct inclusion of STM32_HAL_H and TREZOR_BOARD_H. It should only be used in platform-specific code (typically within trezorhal) and avoided in platform-independent code.

• trezor_model.h: Replaces model.h with no current changes.

These headers should be included using angle brackets (#include <...>) at the beginning of the include block in .c or .h files. While this is not technically required, it helps keep the code organized.