Adding analytical-based initial placer

[behnam-rs]

Motivate of the pull request

• To address an existing issue. If so, please provide a link to the issue:
• Breaking new feature. If so, please describe details in the description part.

Describe the technical details

What is currently done? (Provide issue link if applicable)

What does this pull request change?

Which part of the code base require a change

• Build compatibility
• Documentation
• Regression tests
• Continous Integration (CI) scripts

Impact of the pull request

• Require a change on Quality of Results (QoR)
• Break back-compatibility. If so, please list who may be influenced.

[behnam-rs]

New command line options to use this oprion in Raptor:

--enable_cascade_placer {true, false} Whether to use analytic placement as initial placement. The result is, then, passes through the annealing (SA) placer.

(Default: flase}