ERA001: detect single-line code for try:, except:, etc.

[ottaviohartman]

❯ ruff --version
ruff 0.2.2

As discussed in #10055 , detect single-line code for the eradicate rule:

Example playground

# try:
# ^ works

# try:  # doesn't work

# try: print()
# ^ doesn't work

# same with except, which also doesn't correctly detect plain `expect:`

# except:
# ^ doesn't work

# except Foo:
# ^ works

# except Exception as e:
# ^ works

# except Exception as e: print()
# ^ doesn't work