Add missing exports needed by our projects

[greedyboi]

CHANGES

Scripts:

• Usage of npx to run tsc as tsc needs typescript to be installed, npx is bundled within npm which holds tsc CLI

ADDED

• LumConstants that holds all lum related constants
• LumTypes with types that needed to be explicitly declared (KeyStore, Coin, Account, Log, LogEvent and LogAttribute)
• LumRegistry which is a registry that holds and exports every txs typeUrl with their corresponding interface
• LumUtils with all missing utils needed for the wallet and millions (number conversions, encoding, account decoding and others)

Tested locally as a pseudo-released package with yalc on the wallet and millions.

For the wallet, all wallet imports are working as expected (logs into the account, correctly get data from this account especially vesting infos, HDPath edit works correctly as well).
For millions, as we use only offline signers such as Keplr/Cosmostation/Leap, account login and data fetching work as expected (same as the wallet), the rest was only changing the imports source (old -> new sdk)

[Segfaultd]

Made a few changes on the code to make it cleaner and more aligned with the actual code style.

Please confirm that your test code on Millions & Wallet have no issue working with it.