feat: allow native funding of strategies through batch allocation

[ilpepepig]

Closes #592.

• [x] Add _values parameter to batchAllocate().
• [x] Add error ETH_MISMATCH that throws if msg.value does not match _values.
• [x] Modify internal function _allocate to use a _value parameter instead of msg.value.
• [x] Update IAllo interface.
• [x] Update test suite.
• [x] Added tests for new errors.
• [x] Update Allo.md.
• [x] Update gas-report and gas-table.