[ottl] Demonstrate simpler context constructors

[djaglowski]

This is just a proof of concept PR, rather than an issue.

I've been working with OTTL contexts lately and noticed that some of the parameters seem to be redundant. Looking back at the commit history, I believe the context constructors were created prior to some refactoring in pdata packages, so the redundancy appears to have been inherited from upstream changes.

My question is whether or not we could introduce a simpler set of constructors at this point, and potentially deprecate the old ones, maybe even push these changes down into the functions (which could access the same information).

[TylerHelmuth]

I'm not opposed to refactoring these as they have been a source of pain as OTTL has grown. We've had to change them in the past to support new parameters.

I'd much rather introduce something that scales like Options or a struct or something that can easily take a new parameter without breaking the function signature. We keep saying "this is the last parameter we'll need bc that's all the proto defines" but then there are exceptions (like schema).