[bazel] Define rules-based CC lowRISC toolchain #4270

Job	Run time
Lint (quick)	3m 27s
Lint (slow)	12m 31s
Build documentation	5m 18s
Airgapped build	8m 44s
Run OTBN crypto tests	24m 53s
Run OTBN smoke Test	2m 27s
Verible lint	1m 9s
Verilated English Breakfast	8m 29s
Build Docker Containers	2m 30s
CW305's Bitstream	22m 49s
Build and test software	19m 49s
Verilated Earl Grey	1h 20m 39s
Earl Grey for CW310 / Build bitstream	1h 7m 48s
Earl Grey for CW310 Hyperdebug / Build bitstream	1h 5m 59s
Earl Grey for CW340 / Build bitstream	1h 33m 53s
CW310 ROM_EXT Tests / FPGA test	8m 56s
CW310 SiVal ROM_EXT Tests / FPGA test	37m 53s
CW310 SiVal Tests / FPGA test	26m 14s
CW310 Manufacturing Tests / FPGA test	31m 27s
CW310 ROM Tests / FPGA test	39m 3s
CW310 Test ROM Tests / FPGA test	4m 35s
Cache bitstreams to GCP	0s
CW340 ROM_EXT Tests / FPGA test	5m 41s
CW340 ROM Tests / FPGA test	46s
CW340 Manufacturing Tests / FPGA test	39m 32s
CW340 SiVal Tests / FPGA test	17m 6s
CW340 SiVal ROM_EXT Tests / FPGA test	5m 29s
CW340 Test ROM Tests / FPGA test	3m 40s
Verify FPGA jobs	20s
	10h 41m 7s

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