Sched library moved to `components/lib/sl`

[phanikishoreg]

Summary of this Pull Request (PR)

• Moved sched library to components/lib/sl, that creates static libraries for core sl (should I name it libsl_core.a?), fprr module, thd_static_backend module and sl_lock module.
• Renamed new_boot to llbooter, as new_boot means nothing. And also, moved boot_test directory into implementation/tests/, which is where I think it should be.

Restructuring sl library directory in composite was pending from previous PR. One other minor change is - style feedback fix that I missed in incorporating.

Wanted to do this quickly so I can use sl in vkernel stuff by simply linking to it!

@gparmer @Others

Intent for your PR

Choose one (Mandatory):

• [ ] This PR is for a code-review and is intended to get feedback, but not to be pulled yet.
• [x] This PR is mature, and ready to be integrated into the repo.

Code Quality

As part of this pull request, I've considered the following:

Style:

• [x] Comments adhere to the Style Guide (SG)
• [x] Spacing adhere's to the SG
• [x] Naming adhere's to the SG
• [x] All other aspects of the SG are adhered to, or exceptions are justified in this pull request

Code Craftsmanship:

• [x] I've made an attempt to remove all redundant code: Note:This PR is mainly about moving files to appropriate places
• [x] I've considered ways in which my changes might impact existing code, and cleaned it up
• [x] I've formatted the code in an effort to make it easier to read (proper error handling, function use, etc...)
• [x] I've commented appropriately where code is tricky
• [x] I agree that there is no "throw-away" code, and that code in this PR is of high quality

Testing

I've tested the code using the following test programs (provide list here): *"(Tested only on Qemu, mainly tested to see if all tests run to completion)**

• micro_booter
• unit_schedtest
• llbooter_test
• unit_defci

[gparmer]

No comments. This is good to go. Let @Others know (I know this has been a pain for him).