feat: add Optimism and Base in static chain data and rename chain objects

[lumtis]

Description

• Add the following chains in static chain data
  • Optimism mainnet
  • Optimism sepolia
  • Base mainnet
  • Base sepolia

Add op-stack as a consensus type

Perform some renaming for chain objects: remove the chain suffix in the names. The objects are already in the chains package, namespace. Adding this suffix is unnecessary.

Closes: #2002

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.82%. Comparing base (632b2b9) to head (1c3a1f7).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2258   +/-   ##
========================================
  Coverage    68.81%   68.82%           
========================================
  Files          261      261           
  Lines        16257    16261    +4     
========================================
+ Hits         11187    11191    +4     
  Misses        4589     4589           
  Partials       481      481           

Files	Coverage Δ
pkg/chains/bitcoin.go	100.00% <100.00%> (ø)
pkg/chains/chains.go	100.00% <100.00%> (ø)
x/crosschain/migrations/v5/migrate.go	83.07% <100.00%> (ø)
x/lightclient/types/verification_flags.go	86.95% <100.00%> (ø)
x/observer/types/chain_params.go	99.25% <100.00%> (ø)
zetaclient/chains/evm/signer/signer.go	46.30% <100.00%> (ø)
zetaclient/config/config_chain.go	0.00% <ø> (ø)

[kingpinXD]

lgtm , left a few NITS