Split deprecated-statement rule into multiple rules

[bhirsz]

Currently deprecated-statement covers different deprecations (but not all of them). It's not consistent and requires special handling to cover support for different versions (as specific statements may be deprecated in different versions) and is not supported with existing --target-version option. For that reason we should split it into multiple rules.

For example:

• deprecated-force-tags
• deprecated-run-keyword-if
• deprecated-run-keyword-unless
• deprecated-loop-keyword -> not sure if we should use 1 rule, or split for various statements like Continue For Loop, Continue For Loop If etc
• deprecated-return -> same, as we have [RETURN] and Return From Keyword. We may have separate rules

[bhirsz]

deprecated-force-tags handled here: #1622

[bhirsz]

To avoid creating dozens of new rules, I will group them a bit into following rules:

deprecated-run-keyword-if for Run Keyword If and Run Keyword Unless
deprecated-loop-keyword for Continue For Loop, Continue For Loop If, Exit For Loop, Exit For Loop If
deprecated-return-keyword for Return From Keyword and Return From Keyword If
deprecated-return-setting for [RETURN]

It will be easier to manage fixers for them after the split, while not splitting them too much.

When implementing the fixes, there will be overlap with existing formatters which can be removed in 8.0:

• ReplaceBreakContinue
• ReplaceReturns
• ReplaceRunKeywordIf

Risky parts are replacing it with IF nodes (because we need to split / wrap the node in END block). We could see if we can simply reuse existing node formatters and dump the node content to text replacement or we can do it in smarter way while preserving the code as much as possible. Potentially some of the code could be a lot simplier if we focused on text-only modification (for example splitting on ELSE / ELSE IF / AND in run keywords).

[bhirsz]

Closing the scope for 8.0 for now - due to lack of time. Rules are split, formatters are partly transformed into fixes. Missing ones:

• ReplaceRunKeywordIf to fix
• ReplaceBreakContinue to fix