ENH: List logged dnf transaction cmds as txt or json

[westurner]

• WIP
  • Would this easily forward-port to dnf5?
• Adds dnf history store --all and dnf history store --all --comments
  • TODO: example of the output

[pep8speaks]

Hello @westurner! Thanks for opening this PR. We checked the lines you've touched for PEP 8 issues, and found:

• In the file dnf/cli/commands/history.py:

Line 73:121: E501 line too long (124 > 120 characters)
Line 392:9: E265 block comment should start with '# '
Line 409:25: E265 block comment should start with '# '
Line 411:74: E262 inline comment should start with '# '
Line 412:29: E265 block comment should start with '# '
Line 415:29: E265 block comment should start with '# '
Line 427:47: E226 missing whitespace around arithmetic operator
Line 430:5: E303 too many blank lines (2)
Line 435:17: E125 continuation line with same indent as next logical line
Line 436:21: E117 over-indented