v0.2.0 - Query Interpolation as if it is a string

Change interpolation syntax to be similar to string interpolation

After a discussion with Ecto maintainers

• elixir-ecto/ecto#4239 (comment)
• https://elixirforum.com/t/how-to-pass-named-or-numbered-parameters-to-ectos-fragment/49525/5?u=tessi
• https://groups.google.com/g/elixir-ecto/c/gEqI9lE3HGE

it seems like this feature will not be part of Ecto proper. However, the discussion revealed
a better implementation of this library (thanks @bamorim !) by using string interpolation instead of atom-like names.

This gives:

• better syntax highlighting for param names within fragment query strings
• better compilation time (for usage of the macro as well as for this lib)
• less dependencies for this library