enh: Add param.AutoName

[hoxbro]

Currently, it is just a proof of concept to see if it is possible to add an autoincrement variable name based on the created class.

import param


class T(param.Parameterized): ...
class S(param.Parameterized): ...

print(T().name)
print(T().name)
print(S().name)
print(S.name)

❯ python example.py
T00000
T00001
S00002
S