SRS Transcript Cleanup

[dbanks12]

Copied from PR #36

• Original author: @suyash67
• This copy uses branches with git history restored

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This PR slightly modifies the way we handle the SRS data in barretenberg.

1. First of all, the directory structure of the transcripts changes slightly:
   • On running ./bootstrap.sh in cpp/, the ignition directory would create the monomial and the lagrange directories which will store the respective transcripts downloaded from our s3 bucket.
   • Monomial transcripts are downloaded from https://aztec-ignition.s3.eu-west-2.amazonaws.com/MAIN+IGNITION/monomial
   • Lagrange transcripts are downloaded from https://aztec-ignition.s3.eu-west-2.amazonaws.com/MAIN+IGNITION/lagrange
2. The first monomial transcript ignition/monomial/transcript00.dat now contains 5040001 points and rest of the 19 monomial transcripts contain 5040000 points. The generator $[1]_1$ was added to transcript00.dat. This allows us to remove conditional logic on including $[1]_1$ while reading monomial transcripts.
3. The code to generate a Lagrange transcript from a monomial transcript now also works for size $>2^{24}$. To store Lagrange transcripts with size $>2^{24}$, we split it into multiple files each containing $2^{24}$ points (file size is 1.1GB). For example, we now store the Lagrange transcript of size $2^{25}$ in $\frac{2^{25}}{2^{24}}=2$ files named transcript_ 33554432.dat and transcript_33554432_1.dat. This was done because it isn't possible to write more than 1.1GB of data to a .dat file in our code.

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[ledwards2225]

Looks good to me!