ASN DOT format allowed on input

[melias-tc]

Environment

• Nautobot version: 2.03
• nautobot-bgp-models version: 2.3.1

Proposed Functionality

While Pull #205 now shows the ASN in both integer and dot format, an ASN can still only be input as a 32 bit integer

Allow both 32 bit integer and ASN dot (<16 bit integer>.<16 bit integer>) formats on input for both ASN and ASN Groups.
Would also like to see ASN dot format on ASN Group displays

Use Case

We assign ASNs based on the upper 16 bit values. Each site is assigned a set of ASNs using the same high order 16 bits, such as 65049.1 - 65049.65535. It is easier to enter these numbers in dotted format rather than to have to convert them externally to each of their 32 bit counterparts (4263051265 to 4263116799).