* Reference implementation for Proposal, enable CPU SLT
* code style fix
* add type prop test for invalid anchor count
* add unit test
* fix shapes in attribute test
* temp workaround- disable maring end of boxes list
* Disable CPU smoke test- spec misalignment
* code style fixes
* add some details to the specification
* disable myriadx proposal slt
* review changes, using usigned int and size_t
* improve proposal op shape inference to cover dynamic too, add unit test coverage
* remove unused variable in test body
* remove batch size in tests where its not used
* add post nms topn initialization in tests where it was missing
* review comments
* style fix
* style fix 2
* add tests, remove unused variables, change shape inference checks
* style fix
* add input tensors type checks and test coverage
* align input type in attribute and ngraphreader tests to match specification
* fix wrong dimension in error message
* proposalv4 ref impl
* enable single layer and unit tests for proposalv4 ref impl
* align output termination with cpu, enable cpu slt
* custom slt compares to detect less-than-predicted number of boxes
* custom slt compares to detect less-than-predicted number of boxes
* Clarify output termination in spec
* review comments
* smaller input data for unit tests
* add check for batch_dim being static
* disable gpu slt for proposal
* test data style fix
* test data style fix 2
* add type section to specification
* shape inference improvement
* multiply expected 1st dim in tests by post_nms_topn
* add checks and testcases for dynamic ranks
* indentation, review comments
* reduce code redundancy in ref implementation
* remove comment
* Fix typo in proposal1 spec
* Fix typo in proposal4 spec
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