chore: add dht selectors and validators

[vasco-santos]

Adds dht selectors and validators here to be used across the board easily.

Also removes unecessary EventEmitter types, as this was already fixed

[achingbrain]

If you add a typedef to /src/index.js like:

/**
 * @typedef {import('./types').SelectFn} SelectFn
 * @typedef {import('./types').ValidateFn} ValidateFn
 * @typedef {import('./types').DhtSelectors} DhtSelectors
 * @typedef {import('./types').DhtValidators} DhtValidators
 */

then you can use them from other modules like:

/**
 * @typedef {import('libp2p-interfaces').SelectFn} SelectFn
 */

otherwise you have to do:

/**
 * @typedef {import('libp2p-interfaces/src/types').SelectFn} SelectFn
 */

Which is ok, but needs the typesVersions hack and prevents you from moving that file in future.

[vasco-santos]

This was causing:

src/validator.js:15:19 - error TS2306: File '/Users/vsantos/work/pl/gh/libp2p/js-libp2p-record/node_modules/libp2p-interfaces/dist/src/index.d.ts' is not a module.
15  * @param {import('libp2p-interfaces').DhtValidators} validators

After generated

type SelectFn = import('./types').SelectFn;
type ValidateFn = import('./types').ValidateFn;
type DhtSelectors = import('./types').DhtSelectors;
type DhtValidators = import('./types').DhtValidators;
//# sourceMappingURL=index.d.ts.map

I could not easily work around this issue, so I reverted to the original solution for now

[achingbrain]

Small suggestion inline, not a blocker