move from coniks to optiks

[sanjit-bhat]

• add vrf to cryptoffi
• add rpcffi. need to find workaround for 'any' type
• add Encode to rpcffi
• finish server
• finish auditor
• finish client
• remove hash chain. clients check their digs directly.
• copy netffi from gokv and refactor
• some cleanup
• start advrpc
• goose machine -> primitive
• add adversarial rpc lib
• tests for advrpc and netffi
• cryptoffi RandBytes
• rpc: rename .golden -> .golden.go for syntax highlighting
• rpc: add diff color and change to/from files
• rpc: make methods public, avoid duplicate var names for multi-rcvr calls (workaround for goose bug), rm err type
• update deps
• dependabot: 4am for all ecosystems, monthly actions
• rpc: add nested struct support. change decode to be func, not method, for consistent decoding. make decode args have canonical names for easier proof
• rpc: remove printast
• rpc: small cleanup
• rpc: change encoding from method to func for consis, and slice passing style for efficiency and consis
• rpc: rename read / write -> encode / decode for consis
• rpc: rm support for fixed-len byte slices
• rpc: support list of struct
• rpc: support map ty's, add start of general custom ty infra
• rm coniks impl
• rpc: forgot to ret nil obj in decode err case
• rpc: rename rpc -> serde
• chkpt progress on integrating kt2 w advrpc and mapVal epoch,comm change
• distinguish proofs bw Put, Get, SelfMon
• Get hist obj should hide old vals
• adapt client to all the recent changes
• first draft of overall test
• fix merkle bug. overflow when fetching path proof
• fix bugs in server and client. TC passes
• rename kt2 -> kt
• make goose happy