Change CSV format of call tree report

[mv02]

Related issue: #8496

This pull request reworks and simplifies the CSV output format of call graph report, generated by running Native Image with the -H:+PrintAnalysisCallTree and -H:PrintAnalysisCallTreeType=CSV options.

The new format consists of 3 files:

call_tree_methods.csv

Id | Name | Type | Parameters | Return | Display | Flags | IsEntryPoint

call_tree_invokes.csv

Id | MethodId | BytecodeIndexes | TargetId | IsDirect

call_tree_targets.csv

InvokeId | TargetId

The first two files represent a list of methods and invokes, respectively, while the targets file creates a many-to-many mapping between invokes and target methods. This replaces the original system of direct and virtual nodes and edges. Direct and virtual calls are simply distinguished by IsDirect and they are connected to all relevant method implementations. Entrypoints are not listed in a separate file anymore, instead they are marked by a new column in the methods file.

Most importantly, the new format eliminates the imprecision described in #8496.

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[d-kozak]

@galderz Are you okay with merging this PR or would you like some changes?

[galderz]

@d-kozak Looks good

[galderz]

And thanks @mv02 for tackling this!