Add helper make targets to prepare repo and add new types

[turkenh]

Description of your changes

This PR adds the following two make targets:

# This target prepares repo for your provider by replacing all "template"
# occurrences with your provider name.
# This target can only be run once, if you want to rerun for some reason,
# consider stashing/resetting your git state.
# Arguments:
#   provider: Camel case name of your provider, e.g. GitHub, PlanetScale
provider.prepare:

# This target adds a new api type and its controller.
# You would still need to register new api in "apis/<provider>.go" and
# controller in "internal/controller/<provider>.go".
# Arguments:
#   provider: Camel case name of your provider, e.g. GitHub, PlanetScale
#   group: API group for the type you want to add.
#   kind: Kind of the type you want to add
#   apiversion: API version of the type you want to add. Optional and defaults to "v1alpha1"
provider.addtype:

I have:

• [x] Read and followed Crossplane's contribution process.
• [x] Run make reviewable to ensure this PR is ready for review.
• [ ] Added backport release-x.y labels to auto-backport this PR if necessary.

How has this code been tested

make provider.prepare provider=GitHub

make provider.addtype provider=GitHub group=Organization kind=Project

# Register the new API in "apis/github.go"
# Register the new Controller in "internal/controller/github.go"

make generate

[turkenh]

Issue in Crossplane Tools: https://github.com/crossplane/crossplane-tools/issues/41