feat(core): Add UniformValue type for .setUniforms() etc

[ibgreen]

For #

Background

• In v9, textures, samplers and uniform buffers are not considered uniforms and should be set with setBindings()
• This causes IconLayer etc to fail.
• With this change, setUniform({texture}) will generate a type error

Change List

• Adding a UniformValue type to the setUniforms style APIs will guide applications to do the necessary changes.