make tfhe-rs a bazel dependency

[asraa]

• Adds a tfhe_rs_lib bazel macro that runs heir-opt / heir-translate / rust_library
• Updates all CPU tests to an end to end bazel macro

FPGA tests:
Left the Cargo.toml with the local tfhe-rs folder, and the RUN commands as documentation.

Fixes #235

[asraa]

Oops. Now the old cargo | Filecheck tests are giving me this error:

# RUN: at line 2
cargo run --release --manifest-path /usr/local/google/home/asraa/.cache/bazel/_bazel_asraa/dd6a35b586d0a2d65a5a8939e7a649cf/execroot/_main/bazel-out/k8-opt/bin/tests/Examples/tfhe_rust/add_one.mlir.test.runfiles/_main/tests/Examples/tfhe_rust/Cargo.toml --bin main_add_one -- 2 --message_bits=3 | FileCheck /usr/local/google/home/asraa/.cache/bazel/_bazel_asraa/dd6a35b586d0a2d65a5a8939e7a649cf/execroot/_main/bazel-out/k8-opt/bin/tests/Examples/tfhe_rust/add_one.mlir.test.runfiles/_main/tests/Examples/tfhe_rust/add_one.mlir
# executed command: cargo run --release --manifest-path /usr/local/google/home/asraa/.cache/bazel/_bazel_asraa/dd6a35b586d0a2d65a5a8939e7a649cf/execroot/_main/bazel-out/k8-opt/bin/tests/Examples/tfhe_rust/add_one.mlir.test.runfiles/_main/tests/Examples/tfhe_rust/Cargo.toml --bin main_add_one -- 2 --message_bits=3
# .---command stderr------------
# | 'cargo': command not found
# `-----------------------------
# error: command failed with exit status: 127

--

********************
********************
Failed Tests (1):
  heir :: Examples/tfhe_rust/add_one.mlir


Testing Time: 0.05s

Total Discovered Tests: 1
  Failed: 1 (100.00%)

[WoutLegiest]

Yeah, for the FPGA tests I run them locally on the FPGA server (so really a copy past approach). Normally, the FPGA code in HEIR should represent the small testbench that we can use it from.
Although, we should update it a bit more with all of the new tfhe-rs-belfort libraries and such.

[j2kun]

Go ahead and delete

heir/.github/workflows/build_and_test.yml

Lines 78 to 86 in e70b591

	# Tests specifically for the tfhe-rs codegen
	- name: rustup toolchain install
	uses: dtolnay/rust-toolchain@439cf607258077187679211f12aa6f19af4a0af7 # [email protected]
	with:
	toolchain: stable
	- name: Test rust codegen targets
	run: |
	bash .github/workflows/run_rust_tests.sh

and https://github.com/google/heir/blob/main/.github/workflows/run_rust_tests.sh to get the CI to pass, since it's only failing because there are no more targets to test.

[j2kun]

Nicely done! Just a few nits, hopefully implying more deletion

[WoutLegiest]

Cool! Thanks
Maybe something we should discuss during one of the meetings is how we see the FPGA testings and if we even want the run results (since the outputted code is the same as CPU code)