Feat/fuzz dir and tidy

[lukacan]

• Init command contains option "--template" which will generate "Both | PoC (legacy tests) | Fuzz" trdelnik tests structure

  • for BOTH , both folders (as described below) will be generated
  • for Fuzz - only fuzz_tests will be generated
  • for PoC - only poc_tests will be generated

• Trdelnik-tests structure is as follows:

  • trdelnik-tests
    • poc_tests
      • tests
        • test.rs
      • Cargo.toml
    • fuzz_tests
      • fuzz_0
        • Cargo.toml - I find this separate Cargo manifest for each fuzz test useful if we will support ProgramStubs/ProgramTest
        • test_fuzz.rs
      • fuzz_1
      • fuzz_2

• described structure works essentially as before:

  • "trdelnik test" will call PoC Tests
  • "trdelnik fuzz run fuzz_0" will run fuzz_0 test
  • "trdelnik fuzz run fuzz_1" will run fuzz_1 test
  • if fuzz_x does not exists, honggfuzz will throw an error

• hfuzz_target is in the root of the project

• hfuzz_workspace is in the root of the project (--with-exit-code should work with this location)

• added subcommand "trdelnik fuzz add" which will add new fuzz_x target as described in the structure above

  • currently it does not support custom name , just finds the highest X and generates fuzz_X+1.

• some new fuzzer options were added into the Trdelnik.toml manifest

• build and init has arch option such as build-bpf or build-sbf

• test_generator was renamed to workspace builder

• clean command was moved to the workspace_builder

• discover Anchor.toml/Cargo.tom/Trdelnik.toml was added into invoked commands

• constants were moved to the client/src/lib.rs

• PoC tests dependencies were changed to dev-dependencies as these are used for Tests

• examples were updated to the new structure

• Looks like a lot of changes were made, however there are still plenty of TODO or FIXME that should be resolved. This PR contains only initial logic, that was tested on examples, it should improve the project structure and also readability.