#1784 Integrate back Openroad sta Pull request opened by kareefardi Hierarchical sta now runs only at the signoff stage

+ add STA_MULTICORNER_READ_LIBS to pick between reading liberties vs reading verilog + spefs
+ add reading CURRENT_SPEF in function `read`
+ add ability to not read EXTRA_LIBS in function `read_libs` ~ fix wrong usage of FP_IO_HLENGTH. should be FP_IO_VLENGTH
+ sta/multi_corner.tcl should now work with openroad
+ add -estimate_global and -estimate_placement to `run_sta` and used it whenever applicable
+ add -tool to run_sta to switch between openroad and opensta
+ use -pre_cts whenever applicable

+ add verfied scl to verilator verified list. sky130_fd_sc_hs had verilator errors in its verilog models

The-OpenROAD-Project/OpenLane GitHub Actions: Test Design manual_macro_placement_test (sky130A/sky130_fd_sc_hd) GitHub Actions: Test Design usb_cdc_core (sky130A/sky130_fd_sc_hd) GitHub Actions: Test Design usb (sky130A/sky130_fd_sc_hd) GitHub Actions: Test Design xtea (sky130A/sky130_fd_sc_hd) GitHub Actions: Test Design zipdiv (sky130A/sky130_fd_sc_hd) GitHub Actions: Test Design s44 (sky130A/sky130_fd_sc_hd) GitHub Actions: Test Design APU (sky130A/sky130_fd_sc_hd) GitHub Actions: Test Design wbqspiflash (sky130A/sky130_fd_sc_hd) GitHub Actions: Test Design inverter (sky130A/sky130_fd_sc_hd) GitHub Actions: Regression Test (Test 1506) GitHub Actions: Regression Test (Test 1413) GitHub Actions: Regression Test (Test 1007) GitHub Actions: Regression Test (Test 912) ✅ 6 other checks have passed 6/19 successful checks