Add data source for IP ranges

[karnauskas]

Regarding Issue #6, I'm contributing to data.cloudflare_ip_ranges resource to get v4 and v6 CIDR blocks of Cloudflare IPs.

Example output:

Apply complete! Resources: 0 added, 0 changed, 0 destroyed.

Outputs:

v4_ranges = [
    103.21.244.0/22,
    103.22.200.0/22,
    103.31.4.0/22,
    104.16.0.0/12,
    108.162.192.0/18,
    131.0.72.0/22,
    141.101.64.0/18,
    162.158.0.0/15,
    172.64.0.0/13,
    173.245.48.0/20,
    188.114.96.0/20,
    190.93.240.0/20,
    197.234.240.0/22,
    198.41.128.0/17
]
v6_ranges = [
    2400:cb00::/32,
    2405:8100::/32,
    2405:b500::/32,
    2606:4700::/32,
    2803:f800::/32,
    2a06:98c0::/29,
    2c0f:f248::/32
]

[elithrar]

LGTM (as a Cloudflare dev). Appreciate the tests.

[karnauskas]

What's the release procedure of this provider? When it will be released to standard provider repository?

[radeksimko]

Hi @karnauskas
sorry for the delay in reviewing this. I just merged #28 as it also contained docs and some extra error checks.

Thanks for all the effort you invested into this.