[NOT MERGE] add coverage option to collect line/toggle coverage

[Clo91eaf]

This pr implements line/toggle or any other coverage type in the cover flow of t1. To achieve this, I added the vcs-emu-cover-full target in nix.

• Compile time:

Use -cm line+cond+fsm+tgl+branch+assert to enable all possible coverage types. This change may greatly affect the ci running time, so this PR will NOT BE MERGE.

• Runtime:

1. Run the regression test in ci: At this time, only the coverage of line+tgl+assert is collected. This process is hard-coded and can be changed by modifying the nix script.
   After the ci operation is completed, you can obtain all the coverage through this command.

nix build .#t1.blastoise.t1rocketemu.run._vcsEmuResult --impure
urg -dir ./result/*/cm.vdb -format text -metric line+tgl+assert -show summary -parallel

This process can be accelerated by setting an environment variable:

AWS_EC2_METADATA_DISABLED=true 

2. To run a single test case locally: you can specify the test type you want to run through the cover-type parameter of t1-helper, for example:

nix develop -c t1-helper run -i t1rocketemu -e vcs-emu-cover-full -c blastoise --cover-type line+tgl+assert codegen.vsra_vx