Implement new CMakeLists.txt generation backend (cbuild2cmake)

[brondani]

As a result of the investigation tracked in #1044 the new CMakeLists.txt generation backend should be planned and implemented according to the CMakeLists Proposal.

Work breakdown structure

Area	Work Packages	Priority	Depends	References
1. Test Strategy	1.1. Create a test plan for the migration of integration test cases. All aspects covered by current Build Manager tests must be documented and equivalent go test cases must be implemented	1️⃣		#1 ✔️
	1.2. Implement CMSIS-Toolbox E2E integration tests	1️⃣	1.1	#101
2. Extend csolution	2.1. Explicitly store context inter-dependencies in cbuild-idx.yml	1️⃣		#1272 ✔️
	2.2. Redefine intdir: in the multi-context scenario a solution level intermediate directory is needed	1️⃣		#1243
	2.3. Add pre- and post-build build steps to csolution.yml and cproject.yml in the form of executes nodes	2️⃣		TBD
	2.4. Extend project nodes to accept cmake [generic|standalone], input and output to handle the integration of generic CMake libraries as well as standalone CMake projects	3️⃣		TBD
3. Implement executable cbuild2cmake	3.1. Parse cbuild-idx.yml and cbuild.yml files	1️⃣		#2, #21 ✔️
	3.2. Parse toolchain registration (environment variables)	1️⃣		#3, #22 ✔️
	3.3. Generate Super Project CMakeLists.txt making use of CMake ExternalProject features, set step dependencies and by-products, database generation	1️⃣	2.1, 2.2	#4 #62 ✔️
	3.4. Add pre- and post-build build steps handling	2️⃣	2.3	TBD
	3.5. Handle generic CMake libraries and standalone CMake projects	3️⃣	2.4	TBD
	3.6. For each context: generate CMakeLists.txt, groups.cmake and components.cmake files considering compile options as well languages and scope	1️⃣	1	#1234, #5 ✔️
	3.7. Generate <toolchain>.cmake file	1️⃣		#65 ✔️
	3.8. Create toolchain configuration yml files to replace cmake files	3️⃣		TBD
	3.9. Handle templates for toolchain configuration and CMakeLists at solution and context levels	3️⃣		TBD
	3.10. Generate context specific compile options	1️⃣		#29 ✔️
	3.11. Generate miscellaneous compile options at context, component, group and file level	1️⃣		#31 ✔️
	3.12. Handle abstracted compile options (optimize, debug, warnings) and language standard	1️⃣		#32 ✔️
	3.13. Handle local and global pre-includes	1️⃣		#33 ✔️
	3.14. Process undefines and del-paths at component, group and file level	1️⃣		#34 ✔️
	3.15. Generate linker pre-processing target	1️⃣		#35 ✔️
	3.16. Handle linker script and linker flags	1️⃣		#36 ✔️
	3.17. Generate elf2hex and elf2bin targets	1️⃣		#37 ✔️
4. Extend cbuild	4.1. Extend the cbuild front-end to optionally call cbuild2cmake instead of cbuildgen	1️⃣		#165 ✔️
5. Distributables	5.1. Update CMSIS-Toolbox to incorporate the new binary cbuild2cmake	1️⃣		#1398 ✔️
	5.2. Update the toolbox release flow to directly collect binaries cpackget, cbuild, csolution and cbridge, allowing future removal of the current Build Manager	2️⃣		TBD
	5.3. Add new yml toolchain configuration files and templates	3️⃣		TBD
6. CMake Module	6.1. Further development on CMSIS-Pack-Utils for CMSIS Packs consumption from CMake	4️⃣	3.6	TBD

[brondani]

Except for E2E integration tests and intdir redefinition, all first priority work packages were completed.
The remaining work is tracked here: #1422