fix(memory): prevent add_to_memory() from overwriting events of the same type

[abikooo]

Fixes #242
Fixes #137

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[souro26]

Please add the new tests in existing test files instead of making a new one

[souro26]

observation still stores a dict while other types now store lists. this creates a mixed structure in step_content. It should be unified so all types follow the same format. also, all consumers of step_content now need to handle lists. please keep a single consistent structure to avoid bugs.

[abikooo]

@souro26

thanks for the review. looked into both points. moved tests into existing files and unified all step_content types including observations to use the same list-based structure. all 283 tests passing. lmk if anything else needs attention.

[wang-boyu]

Thank you for working on this. Closing as superseded by #165, which has now been merged and closed #137.