Change names of some methods in resource estimation

[astralcai]

Context:

There were some conflicts with the ongoing decomposition work.

Description of the Change:

• Make resource_params a @property
• Rename resource_rep to make_resource_rep
• Rename resource_rep_from_op to resource_rep and make it a @property

After this change, the following usages:

op.resource_params()
SomeOp.resource_rep(param1=..., param2=...)
op.resource_rep_from_op()

will be replaced with

op.resource_params
SomeOp.make_resource_rep(params1=..., params2=...)
op.resource.rep

Benefits:

More intuitive names for methods and properties (use a noun for a property and a verb phrase for a method)

Possible Drawbacks:

Ongoing resource estimation work may be affected.

[github-actions]

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Please edit doc/releases/changelog-dev.md with:

• A one-to-two sentence description of the change. You may include a small working example for new features.
• A link back to this PR.
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