Rename id argument of callback! to params to match Dash convention

[rpkyle]

Following discussion offline with @alexcjohnson, we should rename the id argument of callback! to params, which aligns with current Dash convention. We already use id as a property within Dash components, so this usage is potentially confusing as-is.

This is a breaking change in the Dash.jl API, and we should probably make the modification sooner rather than later.

Dash.jl/src/app/callbacks.jl

Line 52 in b50e5dc

function callback!(func::Function, app::DashApp, id::CallbackId)

This likely implies that we should consider renaming CallbackId to Params (or SetParams or Setparms or setparms) and callid_str to params_str (and, callid also):

Dash.jl/src/app/supporttypes.jl

Line 3 in b50e5dc

struct CallbackId

Dash.jl/src/utils/misc.jl

Line 78 in b50e5dc

macro callid_str(s)