Dict Equality Checks rapidly exceeds max recursion

**What steps did you take:**
I wanted to compare two (yaml) structures that had been read into data.values and turned into dictionaries.
I used the `==` operator as is our traditional way.

**What happened:**
`- comparison exceeded maximum recursion depth`

**What did you expect:**
a boolean

**Anything else you would like to add:**
the culprit is here: https://github.com/vmware-tanzu/carvel-ytt/blob/develop/vendor/github.com/k14s/starlark-go/starlark/value.go#L1134
because whenever they made starlark they were _really_ conservative re. the stack limits for equality comparisons.

IMO this would be magical to expose via command line flag and/or hardcode several orders of magnitude larger.

(note that if this is exposed via CLI flag, I think there's another place where depth/maxdepth is also hardcoded, but I'll let you-all grep the codebase and consider implementation details like if i'm raising the recursion limit in one place do i probably also want to raise it in all the places? probably?)

**Environment:**
Here is a repro:
```
#@ def buildNest(mm, d):
#@ if d == 0:
#@ return mm
#@ end
#@
#! "i pity d foo"; see below
#@ i = d
#@ mm[d] = {i: buildNest({'pity': 'foo'}, d-1)}
#@ return mm
#@ end

#@ depth = 4

#@ map1 = buildNest({}, depth)
#@ map2 = buildNest({}, depth)

map: #@ map1
#! this exceeds recursion depth when depth >= 5. I pity d foo who exceeds max recursion depth!
nested_map: #@ map1 == map2
```

(i suspect this exists in all versions of ytt released up til today)

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