Add contracts table

[Andrei-Dolgolev]

Added contracts and bytecode_storage tables.

Insert examples:

INSERT INTO bytecode_storage (
    id,
    hash,
    bytecode,
    title,
    description,
    abi,
    code,
    data
) VALUES (
    '550e8400-e29b-41d4-a716-446655440000', -- id (UUID)
    'd41d8cd98f00b204e9800998ecf8427e',     -- hash (MD5 hash)
    '0x6060604052341561000f57600080fd5b60...', -- bytecode (Text)
    'Sample Contract',                       -- title (VARCHAR)
    'This is a sample contract.',            -- description (Text)
    '{"inputs":[],"name":"myFunction","outputs":[],"stateMutability":"nonpayable","type":"function"}', -- abi (JSONB)
    'pragma solidity ^0.8.0; contract Sample { function myFunction() public {} }', -- code (Text)
    '{"metadata": "Sample metadata"}'        -- data (JSONB)
);

INSERT INTO ethereum_contracts (
    address,
    deployed_bytecode,
    deployed_bytecode_hash,
    bytecode_storage_id,
    abi,
    deployed_at_block_number,
    deployed_at_block_hash,
    deployed_at_block_timestamp,
    transaction_hash,
    transaction_index,
    name,
    statistics,
    supported_standards,
    created_at,
    updated_at
) VALUES (
    DECODE('abcdefabcdefabcdefabcdefabcdefabcdefabcd', 'hex'), -- address (LargeBinary(20))
    '0x6060604052341561000f57600080fd5b60...', -- deployed_bytecode (Text)
    'd41d8cd98f00b204e9800998ecf8427e',        -- deployed_bytecode_hash (MD5 hash)
    '550e8400-e29b-41d4-a716-446655440000',    -- bytecode_storage_id (UUID)
    '{"inputs":[],"name":"myFunction","outputs":[],"stateMutability":"nonpayable","type":"function"}', -- abi (JSONB)
    12345678,                                  -- deployed_at_block_number (BigInteger)
    '0x9e1c...',                               -- deployed_at_block_hash (VARCHAR)
    1617181920,                                -- deployed_at_block_timestamp (BigInteger)
    '0xdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeefdeadbeef', -- transaction_hash (VARCHAR)
    0,                                         -- transaction_index (BigInteger)
    'SampleContract',                          -- name (VARCHAR)
    '{"calls": 100, "transactions": 50}',      -- statistics (JSONB)
    '["ERC20", "ERC721"]',                     -- supported_standards (JSONB)
    NOW(),                                     -- created_at (DateTime)
    NOW()                                      -- updated_at (DateTime)
);

[kompotkot]

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