In V2, we want to get rid of the @aws-cdk/assets module,
as it's considered deprecated in V1.
Unfortunately, the module contains an interface,
CopyOptions, that is used, through interface inheritance,
in the public API of many stable CDK modules like ECS, Lambda, ECR, CodeBuild, etc.

While we have a CopyOptions interface in @aws-cdk/core,
it unfortunately shares the same name, `follow`,
with the property in the "old" CopyOptions.
But the two different `follow` properties have different types.
For that reason, if we're going to remove the "old" CopyOptions using JSII's "strip deprecated" option,
we can't use the "new" CopyOptions in the inheritance hierarchy alongside the "old" CopyOptions,
as the two definitions of `follow` would conflict.

For that reason, create a new FileCopyOptions interface which renames the `follow` property to `followSymlinks`.
Also add a FileFingerprintOptions interface that does a similar trick to the FingerprintOptions interface
(which extends CopyOptions), which is used in the public API of modules that use Docker assets.

Also extract a few module-private interfaces to avoid duplication of properties between all of these interfaces.

Co-authored-by: Elad Ben-Israel <benisrae@amazon.com>