50 fix constants to enable indexing of new pairs and pools

[gianfra-t]

Closes #50.

Changes in this PR

• Addition and modification of token addresses in TOKEN_METADATA_MAP, which is required to properly handle any incoming token, otherwise the event with will be ignored or wrongly indexed.
• Addition of Pendulum's CHAIN_ID, and corresponding getter function.
• Modification of the handleTokenDeposited function. Previously, for any deposit related to ZenlinkLPToken we were creating a Burn addition to the transaction entity, when it should be a Mint that represents the creation of said LP token. Please, see bifrost implementation for the same handler. This was leading to problems when indexing a liquidity addition event, where a mint entry in the transaction is expected.
• Addition of farming types to typegen-pendulum.json and regeneration of types.
• Addition of new tokens to WHITELIST.

Other changes

• In function killFarmingPoolInfo, we modify the condition to handle ZenlinkLPToken token kind instead of LPToken, and transform it to zenlink id in the same way as updateFarmingPoolInfo. This change is not necessary for the issue and sadly, there are no "kill pool" events to test it.
• Also in lines with the previous change, we remove unnecessary enums and objects.

[gianfra-t]

@ebma I sent a re-review because for some reason it is preventing the merge, and no changes were done.

[ebma]

Ah merging is blocked because the last commit is mine so my approval doesn't count anymore. I'll merge it anyways.

[gianfra-t]

Thanks! I will deploy the new versions shortly.