141 fix behavior of virtualfilesystem functions in blockingnon async context

[AlixANNERAUD]

This pull request removes the usage of the futures crate throughout the codebase, replacing all references and usages with the project's own task module. This affects dependency management, code imports, and all instances where asynchronous blocking was performed. The change streamlines async handling and reduces external dependencies.

Dependency and workspace cleanup:

• Removed futures from the workspace dependencies, member list, and individual crate Cargo.toml files, including drivers/native, drivers/wasm, modules/abi/context, modules/abi/definitions, modules/bindings/host, and modules/bootsplash. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]

Code refactoring:

• Replaced all futures::block_on calls with task::block_on in Rust source files, including device operations, window management, file system functions, memory allocation, and bindings. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10] [11] [12] [13]

Minor UI adjustment:

• Changed KEYBOARD_SIZE_RATIO from 4.0 / 1.0 to 3.0 / 1.0 in executables/shell/graphical/src/layout.rs to adjust keyboard sizing.