Replace compiled_contracts.sources column with source_codes and compiled_contracts_sources tables
#15
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This PR adds the two new tables that will replace the
compiled_contracts.sourcescolumn:source_codesandcompiled_contracts_sources.In
source_codeswe provide the source hashes (sha256,keccak256), the language (solidity,vyper,...) the content of the file and the standard timestamp and ownership fields; we use the file's sha256 as primary key.languageis stored here to avoid having to joincompiled_contractto find the language of that source.compiled_contracts_sourcesis a many-to-many relationship table betweencompiled_contractandsource_codesusing their respective PK as foreign keys (compilation_id->compiled_contract.id,source_code_hash->source_codes.source_codes). Incompiled_contracts_sourceswe also have thepath, since it varies for every compilation. This table doesn't contain timestamp and ownership fields since it's an extension of thecompiled_contracttable.Diagram